I just got a "race" cat off ebay for pretty cheap. They said it would give me 15 hps, is this what i should expect? Also, there are no installation instructions, does anyone know how to or have done this? it looks pretty simple, but just so i dont **** anything up... thanks

 

No it won't give you 15hp. Cats arn't all that restrictive when in proper working order. I like how they sell it as a "race cat" considering it isn't a cat at all, just a straight piece of pipe. Instilation is pretty simple, soak all four bolts with something like liquid wrench a day before you plan on taking the old cat off.

 

15hp is WAY overstated....enjoy

 

Making a Maxima literally FLY is more probable than pulling 15 hp from a cat. Even if it meows its *** off.