I pulled the trigger and ordered the Hooker Cat Back for my 96 Z28.

The engine is stock except for the functional SS Ram Air hood I added. So how much HP gain will I get by now adding the Hooker Cat Back system??

 

Now all you guys that have the Hooker exhaust have not placed in on a dyno, before and after?

Someone has got to know how much additional rwhp this exhust adds. I know everyone did not just by it for the sound.

My guess is about 5HP.

 

I think it would be more like 10rwhp. I don't have this cat-back system, but on average, most cat-back systems seem to add about 10 rwhp, of course this depending on how well your engine can "breathe out". With the mods you have, my guess is about 10rwhp.

 

I felt the gains much more on the top end.

 

Mine was already on the car when I bought it, so . I concur with the 10 rwhp though, thats about right for a catback.