I also have an ATI. I'm in the process of putting forged pistons & rods into the engine, adding DC headers and increasing the boost to 10 lbs. Just make sure you get a pro to do the tuning for you.

 

Pimp who did you have do the tuning for you?

 

I live in the Toronto (Ontario, Canada) area and had it tuned by a shop in Mississauga called Neetronics. Really bright guys. My car is back in their shop having this winter's goodies added right now. Hopefully the engine will be back in the car & tuned up by the end of the month.

 

Tuning is key.
One thing i can say for sure though: a little rumbling through most threads, i see some, well not ignorant, just not well informed posts. Backpressure is never good... perious. ...trust me you dont want that, especially in the exhaust, after the Exhaust manifold. The header is where scavenging of the exhaust gasses occurs and backpressure plays a role. But after that, its all good, open up the piping diameter and at a certain diameter the actual exhaust wont do much. The object in the exhaust itself is to remove as many bends and bottlenecks in the system.

Bottlenecks are what kill power. Backpressure seems to occur where exhausts are not properly matched to their engines.

 

my car is running really well at the moment its too bad my damn zentronix lcd screen went out! i cant read my A/f you guys know if i can get a normal a/f if i already have the widebad o2? I was looking to get some dyno time and 1/4mile my car this weekend without then with slicks to see how i do but im might hold off until i can really see my a/f. Someone mentions no back pressure because of my borla and yea i konw what your talking about even my butt dyno felt it =( way back when i was N/A it was depressing but now with the ATI its perfect for luanching and high mph or hi rev pulls. sounds soo good too. =) i wouldnt recommend borla if your going to stay n/a stillen seems to be the way to go i guess OH well live/spend and learn =/.