Hey i was just wondering i heard that if you take off your cat yoo get 20hp and the sound of the car be much louder with intake & exhaust i was wondering if its true.i know its illegal. If so by taking your cat off will this damage your car later on and before taking you emission you install your cat bak on will they be able to notice that the cat has been takin off? If someone could please reply bak and let me know Thanks.

 

What you want is a test pipe. If you just took off the cat and left the rest open it would be ridiculously loud. Get a test pipe and you'll get decent gains.

 

Decent gains of maybe 2 or 3 hp. The cats on the 5th gens aren't too restrictive. There were dynos done between the RT cat and the OEM cat, no difference. Really only see a major difference if you were supercharged, turbo, or nitrous.

 

Do you have one?

 

Have one what? Supercharge? Turbo? Nitrous? Test pipe? RT cat? OEM Cat?

 

[i like the muffler on my max. when u reach a high rpm the muffler opens the second pipe to balance back pressure i guess. would it be decent to mod test pipe / b pipe / cat back / y pipe and keep the oem muffler?

 

Yeah that's a good overall exhaust mod. WHen you get the b-pipe though make sure to keep a resonator otherwise it would be too loud with the y-pipe.