I am wondering how much it cost for you to have them installed if you didn't do them yourself and how much power did you gain from it.

 

my hotshots are still in the box awaitng install, but my frankencar catbacks been on for over two years. had it put on by a friend so it cost me nothing, and id say the power gain was next to nothing from waht i could tell.

b4 u install the catback get new hangers ure gonna need them. i got the cheap eurothane ebay ones. they work great at holding up my boat anchor catback.

 

I had the timing advance and the headers done at the same time. I can tell a difference, but I still need to get a new MAF.