those of you with the Z (not SS), how much HP did you gain by installing the magnaflow catback (15684)

 

on an otherwise bolt on car, i would say a solid 10hp...you really can't expect too much more than that...

 

I've never dynoed my car, but after the install, there was a much greater throttle response and enough horsepower gain to tell a NOTICEABLE difference. I have loved mine since I got it.

 

thanks guys,
i am going to get my from ebay, how much should i expect to pay for installation ?

 

expect to pay nothing....install it yourself...takes an hour 2 at the most. good cat back system you will like it!

 

yeah you "should" be able to install it yourself using clamps. but if you want it welded up...probably about an hour of work at a shop...so maybe $50-75 depending

 

I don't think just adding a cat-back to a stock car will add too much power. Install some LTs and you might see a 10 RWHP jump, but I would never expect much otherwise. I would highly recommend the system, it sounds really good.

 

This is incorrect. You should see around 10+rwhp from just a catback - if you're going from a non-SS/WS6 LS1 f-body. A little less if you have an SS or WS6 exhaust. You should see at least that much *more* again if you add longtubes...
Good luck!
Shane