I have a '04 A4 with Kooks Signature Series LT's, Borla CB, K&N cai and I had a Predator Tune. When my Kooks were put on a few months ago in the hot summer my car put down horrible numbers for these mods:
293 HP
306 LB/FT
The numbers shocked me but I knew with the headers being untuned and it being 90+ degrees it wasn't going to be pretty.
Today I decided to drop the Predator and get a dyno tune from "Carter Racing". This is what I got:
339 HP
355 LB/FT
I'm happy with the results. I gained 46 HP and 48 lb/ft from the last dyno!! The Kooks Signature Series are a blast. This was done with a dynamometer on the same dyno btw.
Kooks, Borla, K&N, tune, LS1 GTO A4 
