the only catback you want is the stillen. its amazing, sounds perfect and i mean perfect. not to loud at all. i love my stillen alot. if i was u i would not put a underdriven pully on your car. there not a good mod at all, leave it stock or get a lightweight pully, underdriven throws the harmonic rotation out of balence and wear ur motor out much faster.... so sell that ****!!!

 

Might want to check your info before offering incorrect advice. The stock pulley is balanced to the engine. Its weight reduces the harmful vibrations and harmonically balances the engine. Any other lightweight or underdrive pulley throws this balance off unless you rebuild the engine and have it balanced accordingly.

 

umm that is basicly what i said. underdriven is much worse than stock, light weight is no where near as bad as underdriven.... i have never read or heard that a light weight pully can cause damage due because there same oem size just lighter.. either way i want be putting either on my car! had one on my 02 wrx from previous owner and wish he never put it on.....