Everything that STILLEN does is performance driven. The second thought is "how will this effect emissions and/or legality."
One thing to keep in mind is that a cat-back exhaust has ZERO effect on your emissions legality. As long as you aren't modifying or by-passing your catalytic converters you can (legally) do anything you want to the exhaust system.
Your only "legality" concern with a cat-back exhaust is going to be noise. Some states are starting to crack down on noise ordinance regulations and issuing tickets for exhausts that are too loud. The problem is that the only state that actually has any kind of regulation is California. So, STILLEN went ahead and performed an assortment of tests to the California standards and we found that our exhaust is completely compliant with California sound decibel standards.
Keep in mind that STILLEN is comprised of a company of enthusiasts. Steve Millen is a world champion race-car driver. Our lead engineer has a modified 300ZX. Our marketing manager has a very cleanly modified G35 coupe. I have built a few extensively modified vehicle's myself. Our sales team consists of enthusiasts who own everything from turbo supra's to G sedan's and highly modified trucks. Everything we do, we do as enthusiasts which means cost and "ease of manufacturing" and pretty much everything else is a second thought to performance and function.
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