[Sunrise161]

Originally Posted by KoolBRZ

The tune is dependent on exhaust back-pressure. I am currently working with an exhaust that has no cats, and only one resonator. The axle-back exhaust does supply some back-pressure though. The tunes Shiv posted before work fine for MT's, but low-end torque is sadly lacking for AT's with modified exhausts. If you have a completely stock exhaust though, you will have more low-end torque. Back-pressure = low-end torque, but limits high-end horsepower. It's all because the ESC pressurizes the Intake. When there is valve overlap, the ESC can simply blow the fuel straight through. Since the exhaust back-pressure is fixed, while intake, timing and fuel are variable, the tune then has to be adjusted to the exhaust.
That said, what is your CAL ID, and what are you running for exhaust?

Kool,

Was your Shredder tune good for stock manifold, TRD exhaust? If you're putting one together for godzuki, mine is D00D.