So i just got a used greddy evo exhaust last night. Do you guys reconmend changing the gaskets on the exhaust or do you think the used one are fine? They seem in ok condition. And what type of gains should i see with just the exhaust and stock header.

 

my rule of thumb is, if i'm bolting on something else ex... exhaust, head........i'd replace the gasket, can't risk losing hp cause of a bad gasket

 

i dont thin kyou'll see more than 8WHP, prolly even less.

 

Don't haf *** it. go to an exhaust shop and get the gaskets. whe i did mine they gave me the gasket for free. but even if you have to pay for them, they shouldnt be more than 3 bucks each. get both, the one for the exhaust its self and the one to the cat.