Quote Originally Posted by MitchieGTP View Post
i still dont see how this can be argued. Maybe if you had dyno numbers from an 11 second car proving that a bigger cat back did nothing for it, but I can guarantee there is some power being lost in a 2.25" catback on a 3.8L with a blower (let alone an 11 second one). No doubt it made great numbers...but could it have made better numbers with a bigger mandrel bent exhaust?? I know that a lot of power is lost at the manifold and downpipe....thats why when i put a pulley on my gtp i used a powerlog and 3" r/t downpipe...but I'm definitely regretting not putting on a catback.


realdiehl...as far as your "LOLWUT?" comment..im not too sure what ur asking. And the guys at the track that I talked to that said they had good gains from their cat backs were w-body guys (either regal gs or gtp).
look, let me clear this up for you. its not that you wont make more power, its that youll not make enough power from it to justify the cost of replacing it. regardless of how heavily you are modded, dropping the cat back or going bigger is worth 5-7 whp max, which most people cant even tell the difference between.

there, ended that argument. this is why we say it is a waste to change out anything in the catback unless youre knocking on mid 12s or faster with your car (~300whp +).