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Compatible for Mercedes compatible for Smart Fortwo 1.0L 2008-2015 Secondary Air Injection Smog Pump
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Cast Iron Exhaust Manifold compatible for Chevrolet S10 compatible for GMC Sonoma 2000-2003 L4 2.2L Gasket
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EGR Valve Exhaust Gas Recirculation compatible for Acura ILX RLX MDX TLX 18011-R1A-A00
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Secondary Air Injection Smog Pump compatible for Chevy GMC Isuzu Hummer H3 07-2012 12610063
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Vapor Canister compatible for Chevrolet Express 1500 Van Vapor Canister 2003-14 911-268
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Exhaust Manifold w/Gasket Kit compatible for Dodge Ram 1500 V8 4.7L 2002-2007 674-909
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Secondary Air Injection Check Valve compatible for GMC Envoy XL SLE Sport 4.2L L6 2006
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Exhaust Upgrades: Sound, Flow and Staying Legal
Written by the PickupChain team · Last reviewed October 17, 2026
Most truck exhaust upgrades are about sound and a small gain in flow. Axle-back systems replace only the muffler and tips and are the simplest. Cat-back systems replace everything behind the catalytic converter and give a bigger change in sound and flow.
Emissions parts are a different matter. Catalytic converters, diesel particulate filters and EGR systems are required by federal law on road vehicles. Removing them is illegal for street use in all 50 states and can fail inspection. Only buy emissions parts that are listed as legal replacements for your state.
California and states that follow CARB rules require an Executive Order (EO) number for many aftermarket parts. Look for CARB-legal labels if you live there.
Frequently Asked Questions
+Cat-back or axle-back exhaust?
Axle-back systems are cheaper, quicker to install and mainly change the sound. Cat-back systems replace more piping, change sound and flow more noticeably and often add a little power.
+Will a new exhaust cause drone on the highway?
Some aggressive systems produce a low hum at cruising speed called drone. Look for systems with resonators or descriptions that mention reduced drone if you drive long distances.
+Do I need a tune after an exhaust upgrade?
A cat-back or axle-back exhaust does not require a tune. Headers and downpipes often do, and they may affect emissions compliance.