if i leaev my stock cat on how much hp will i gain if i replace it with a test pipe instead or is the stck cat fine with 3 inch piping with 2.5 downpiep

 

you live in ca and you are going to take it off?

 

Putting emissions aside for the monent (heres my opinion). When running forced induction on cars especially turbos, they hate back presure. Ive heard of people gaining up to 40 horses just by freeing up the exhaust (open down pipe vs. stock exhaust). So by removing your cat and putting a free flowing exhaust you should notice a gain in horsepower.

 

take it off especialy if you running turbo.

 

Just get a carsound cat....flows great.

 

live in cali and dont have a cat but shhhhh all i did was weld my heat shield from my cat onto my test pipe and no one knows the difference

 

But you can definately smell the difference... Some people actually like that gasoline smell tho.

 

Ya, it smells really bad. I get paranoid when cops on motorcycles drive by me.

 

Do you really smell it while driving? Is there much of a difference between no cat and a 3" carsound cat?

 

Personally, I will be running cats on both of my turbo cars. On the street that is At the track it's open dump. I'm willing to sacrafice some street ponies to be green, and full power should only be used at the track anyway...riiiight

 

i dotn have a cat on my car , and i cant smell anything . might be able to smell a bit at wot due to running rich , but thats about it

 

lol

i want to see a pic of that!!