Buying guide

Exhaust and tuner upgrades on a premium motorcycle: the EPA labels, the 2026 Vance & Hines settlement, Illinois’s muffler law, and your warranty

Updated October 31, 2026 · Written by the House of Biz & Company Editorial Team · General information, not legal or financial advice

The right exhaust note and a crisp throttle are part of what makes a great motorcycle yours. The connoisseur gets both without inheriting a legal problem, a dead warranty, or a part its own maker has abandoned. With EPA’s September 2026 order against one of the best-known names in motorcycle exhausts, and a summer of “Freedom to Fix” headlines, here is what federal and Illinois law actually allow, read from the orders and the regulations themselves.

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This is general information drawn from the government records and statutes cited below, not legal advice. We don’t sell, install, or recommend any exhaust, tuner, or parts brand, and we earn nothing from any company named here.

Why this matters now

The right exhaust note is part of the pleasure of a great motorcycle, and an owner who has chosen a Ducati, a BMW, or a fully dressed Harley-Davidson tourer naturally wants it to sound and pull the way he imagines. Federal regulators have just put a fresh marker down on how far that can go. On September 30, 2026, EPA Region 9 filed a consent agreement and final order with V&H Performance, LLC, which does business as Vance & Hines, over aftermarket exhaust parts sold in 2018 [1]. The company announced the resolution on October 22, 2026 [2]. Meanwhile, Washington’s summer “Freedom to Fix” guidance has been widely read as loosening the rules on modifications, which it doesn’t do [7][8]. Here is what the law actually asks of a premium motorcycle’s exhaust and engine tune, how to read the labels before you buy, and what a modification does to your warranty.

1. The Vance & Hines settlement, in the order’s own words

EPA alleged that between April 1 and September 27, 2018, the company made, sold, or offered for sale 16,888 full exhaust systems, head pipes, and slip-on exhausts for highway motorcycles that didn’t include exhaust after-treatment, some of them designed to replace catalytic converters [1]. The order lists them as intended for certified Harley-Davidson, Indian, Suzuki, Kawasaki, Honda, and Yamaha motorcycles, and its appendix names Harley-Davidson Touring, Softail, and Sportster part numbers among them [1]. EPA treated each one as a defeat device: a part whose principal effect is to bypass, defeat, or render inoperative an emissions control [1][4].

The company neither admitted nor denied the allegations and agreed to a $900,000 civil penalty, payable in three installments that come to $924,091.68 with interest; EPA set the amount after analyzing a documented inability-to-pay claim [1]. Three conditions matter to owners more than the penalty does. The company represents in the order that it has stopped offering installation instructions, technical support, and marketing for the listed parts; it has told distributors and customers that it no longer honors warranty claims on those parts; and it has notified every customer who bought one since January 1, 2018 [1]. If you own, or are about to buy, a motorcycle wearing one of the listed systems, assume there is no maker’s warranty or support behind it. The company says it has since spent years re-engineering its line and will concentrate on performance exhausts, fuel-management products, and air intakes [2].

It isn’t the first case in the segment. In an earlier settlement, EPA and the Justice Department required Harley-Davidson to stop selling roughly 340,000 engine tuners EPA said could raise emissions, to buy back and destroy dealer stock, to sell only tuners certified by the California Air Resources Board (CARB) in the future, and to pay a $12 million civil penalty [9].

2. The emissions rule: what “tampering” means on a motorcycle

The Clean Air Act contains two prohibitions. One makes it illegal for anyone to knowingly remove or render inoperative an emissions control after a vehicle is sold. The other makes it illegal to manufacture, sell, offer, or install a part whose principal effect is to defeat one, where the person knows or should know it will be used that way [4]. EPA’s written enforcement policy says both apply to highway motorcycles, cover hardware such as modified exhaust pipes and software such as engine tuners and tunes, and apply for the life of the vehicle, whether or not its warranty or regulatory useful life has ended [3].

The statute sets civil penalties of up to $25,000 for a manufacturer or dealer who tampers and up to $2,500 for anyone else, with each defeat device counted separately [5]. Adjusted for inflation, those maximums are now $59,114 and $5,911 for penalties assessed on or after January 8, 2025 [6]. EPA says it generally concentrates its civil enforcement on companies that make or sell defeat devices, on companies that tamper with commercial fleets, and on service shops that routinely delete emissions equipment [3]. That is a statement of priorities, not a permission slip.

The same policy describes when EPA typically won’t act: when the person has a documented “reasonable basis” to conclude the change doesn’t harm emissions, and the documentation exists at or before the time of the work [3]. Its examples include a repair or replacement that is identical to the certified configuration, emissions testing showing the altered vehicle still meets its standards for its full useful life, certification under EPA’s own aftermarket-part program, and a CARB exemption, used under CARB’s own terms [3]. Changes that affect the on-board diagnostic system fall outside that safe harbor and can draw enforcement regardless of their effect on emissions [3]. The policy also notes that many states have their own tampering laws, which it doesn’t displace [3].

3. What “Freedom to Fix” did and didn’t change

A presidential memorandum of June 29, 2026 directed EPA to clarify what owners may do to repair their own vehicles, to speed testing of aftermarket parts, and to consider deprioritizing civil cases against individuals who try in good faith to restore their vehicles to original configuration [7]. On July 1, EPA responded with guidance affirming that manufacturers must give owners the same service and repair information they give their own branded service centers, and it recognized the Specialty Equipment Market Association’s SEMA Certified Emissions (SC-E) program as an alternative way to show that an aftermarket part doesn’t harm emissions [8]. EPA’s own announcement says these actions “do not change the law, weaken emission standards, or reduce compliance obligations” [8]. Outside counsel reading the guidance reached the same view: repairs are lawful when the vehicle goes back to its certified configuration, the July 1 letter doesn’t explicitly promise leniency toward individuals, and California’s own parts-approval requirement still applies to parts sold or installed in that state [7]. In short, the guidance is about repair. It isn’t a license to remove a catalytic converter or install an unapproved tune.

4. The noise rule: two labels worth finding

Exhaust sound has its own federal regime, separate from emissions. Street motorcycles of model year 1986 and later must not exceed 80 dB(A) under EPA’s test procedure, and must keep meeting that limit for an Acoustical Assurance Period of one year or 6,000 km (3,730 miles) after sale, whichever comes first [10]. Two permanent labels make the system checkable:

On the motorcycle. A plastic or metal label headed “Motorcycle Noise Emission Control Information” gives the model year, a model-specific code, the serial number, and the noise standard, and states that modifications causing the bike to exceed federal noise standards are prohibited [10]. The code begins with the maker’s three-letter abbreviation from the regulation, for example BMW, DUC, HAR, KTM, MVA, or TRI [10].
On the exhaust. Every original or replacement system subject to the rule must carry a permanent label headed “Motorcycle Exhaust System Noise Emission Control Information”, readable once installed, stating the noise standard it meets and listing the model codes it is approved for, with the warning that installing it on other models may violate federal law [11].

Read a label’s wording as well as its presence. A system marked “for use on closed course competition motorcycles only”, one labelled for pre-1982 motorcycles only, and one marked “For Export Only” are, by their own federal label language, not systems for a modern street bike [11]. Federal law separately prohibits removing or rendering inoperative a noise control device other than for maintenance, repair, or replacement, and using a product after that has been done [12]. Makers must tell owners that removing or puncturing the muffler, baffles, header pipes, or other exhaust components is likely to be tampering [11], and an act a manufacturer lists as tampering is presumed to be tampering unless it is shown that noise didn’t increase or the bike still meets the standard [10]. The regulations also leave states and cities free to enforce their own noise rules [10][11].

Upgrade	What to ask for before you buy or install	Red flags
Slip-on or full exhaust	The EPA noise label listing your bike’s model code [11]; whether the system keeps the catalytic converter your bike was certified with, or has a CARB exemption or other documented basis [3]	“Competition only”, “For Export Only”, or no label at all [11]; a design that deletes the catalyst [1][3]
Engine tuner or reflash	A CARB exemption, EPA certification, or emissions-test documentation for your exact model, in hand before the work [3]	Anything that alters or silences the on-board diagnostics [3]
Used bike already modified	Both labels, the original parts if the seller kept them, and receipts showing what was installed [10][11]	A system on the Vance & Hines order’s list: no warranty or support from its maker [1]

5. Illinois, and California if you ride there

Illinois has its own muffler statute. Every motor vehicle on Illinois highways must have an adequate muffler or exhaust system, in constant operation and properly maintained, to prevent excessive or unusual noise; no cutout, bypass, or similar device is allowed; and no one may modify the exhaust in a way that makes the vehicle louder than with its original muffler [13]. Motorcycles are not subject to Illinois’s vehicle emissions testing [14], but that exemption doesn’t touch the federal tampering rules, which apply whether or not a state ever inspects the bike [3].

If you keep a motorcycle registered in California, the label becomes a ticketable item. California prohibits parking, using, or operating a California-registered motorcycle made on or after January 1, 2013, or one fitted with aftermarket exhaust equipment made on or after that date, unless it bears the required federal EPA exhaust label; it is a secondary infraction, $50 to $100 for a first conviction and $100 to $250 after that, and proof of correction is required [15].

6. Your warranty: what a modification can and can’t cost you

Federal warranty law protects your choice of parts. A warrantor generally may not make coverage conditional on using its own branded parts or service unless it provides them free [18]. In 2022 the FTC approved a final order requiring Harley-Davidson to stop telling customers that independent repair or third-party parts would void its warranty, to add language saying so, to notify customers, and to have dealers remove deceptive displays [16]. Our new-vehicle warranty guide covers the tie-in rules in full.

The protection has limits. If an aftermarket part is defective or badly installed and damages a covered part, the manufacturer or dealer can deny coverage for that damage, although the FTC says it must prove the aftermarket part caused it [17], and the rules allow a warranty to exclude damage caused by unauthorized parts [18]. EPA adds that if you choose a noncertified part, the Clean Air Act doesn’t guarantee warranty relief [8]. And a part’s own maker may withdraw its warranty, as the Vance & Hines order shows [1]. Customized parts also need to be insured for what they cost; see our motorcycle insurance guide.

Before the wrench comes out: a checklist

Photograph the motorcycle’s noise label and note its model code [10].
Find the exhaust’s EPA label and confirm your model code is listed, and that it isn’t marked for competition, pre-1982 bikes, or export [11].
Ask whether the system keeps the original catalytic converter; if not, ask for the CARB exemption or other written basis [1][3].
For a tuner, get the CARB exemption, EPA certification, or test documentation for your exact model before it is installed, and avoid anything that changes the on-board diagnostics [3].
Keep the original exhaust and the receipts for everything installed; EPA expects documentation to exist at or before the work [3].
Buying used? Compare the parts to the Vance & Hines order’s appendix and ask for the paperwork [1].
Remember Illinois’s muffler law, and California’s label law if the bike is registered there [13][15].
Tell your insurer about every added part, so the policy values them (see our motorcycle insurance guide).

Frequently asked questions

Is it legal to put an aftermarket exhaust on a motorcycle?

Yes, if it keeps the bike within the rules. Federally, the replacement system should carry an EPA noise label listing your model, and it must not defeat emissions controls such as a catalytic converter unless there is a documented basis like a CARB exemption. In Illinois, it also can’t make the bike louder than the original muffler [3][11][13].

Will an aftermarket exhaust void my motorcycle warranty?

Not by itself. A warrantor generally can’t void coverage just because you used third-party parts, and the FTC ordered Harley-Davidson to say so in its warranty. But damage the aftermarket part causes can be excluded, and the FTC says the manufacturer must prove that link [16][17][18].

Do motorcycles need emissions testing in Illinois?

No. Motorcycles are among the vehicles not subject to Illinois emissions testing, but federal anti-tampering rules still apply to them for their entire life [3][14].

What did Vance & Hines agree to in 2026?

In an EPA order filed September 30, 2026, it neither admitted nor denied selling 16,888 exhaust parts in 2018 that EPA called defeat devices, agreed to a $900,000 civil penalty, stopped supporting the listed parts, and told customers it no longer honors warranty claims on them [1].