OBD-II vehicles are plug-in tested, not sniffed.
Mine just passed again with HF cats.
Cat-back exhaust, or any exhaust, has no effect on emissions.
Install the HF cats for a little more sound, cooler temps. and a few more HP.
Does the size of the pipe really make a difference? from a 2.5inch pipe (stock) to 3inch? When I got my muffler cut out, they just used the 2.5inch pipe to replace because the inlet for the tips were that size.
Sound differnce? Yes, 3 " is louder than 2.5"
Power difference? Yes, because most all catbacks come with higher-flowing (louder) mufflers.
Headers, Hi-flow cats, and a 3" catback have been documented on many dynos to add HP. You can get a range of HP from say 25 - 50 at the rear wheels.
The stock exhaust is not bad, but the flex pipes will eventually deteriate. But, for all the time they are deteriating, they usually reduce flow!
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.