the stock catback on the 05 gtos are considerably good, i plan on keeping the stock catback and replacing with LTs and hi flow cats. You should see a 20-25rwhp gain for LTs and Cats, with the Stock catback. Ive heard people switching to other catbacks and only gaining 5-7rwhp over stock.
__________________ 99 Camaro SS A4 SOLD | TSP Lid | Pacesetter LTs | Duals | TriFlow | Jantzer P TB | FAST LSX | Pulley | 3.73s | FMS F14 Cam | TEA Stage 2.5 Heads | Midwest 3600 | NGK | Morroso | Eibach | Bilstein | Bunch of extras | Black Zr1s | 315s | 05 GTO lS2 IBM M6! TOTALED!
2006 C6 Blk/Blk M6 Vette 3LT, Z51, Chromed
| Vararam VR SC1 | Ported TB | FAST 92mm | LG Pro LTs | Catless Xpipe | B&B Bullets | Tuned by LG |