Sep.2026 17

Emissions Testing and Aftermarket Exhaust: What We Can and Cannot Claim

Introduction
Emissions rules vary by country and state and apply to a whole system rather than one part. Here is our honest position, and what to check before you modify.
Details

Our position, stated plainly

We do not certify a part for a jurisdiction we have not tested it in. That is not a hedge, it is the honest limit of what we can claim. Emissions rules vary widely between countries, between states within a country, and between model years - and they apply to a complete system, not to a single component.

Why a part cannot be emissions legal on its own

An approval is issued against a vehicle configuration. Change one component in the path and the configuration that was approved is no longer the configuration you are driving. That is why two customers can fit the same part and end up with two different legal positions, depending on what else has been changed.

Emission-control devices

Removing or altering an emission-control device is a separate question from whether a part fits or performs. In many markets it can make a vehicle unlawful for road use, quite independently of any warranty consideration. If your build plan involves that, understand the rule in your own market before you commit to it.

What to do before you modify

Check your local inspection standard rather than a forum thread. Then send us your chassis code, build year and market, and we will describe exactly what the part does and does not include - including what it leaves in place - so you can decide with real information.

Our role in this

We will tell you what the hardware is. We will not pretend to certify your car against a rule set we have not tested against. That distinction is worth more to you than a comfortable answer.