Thread: New GXP Owner...Trying to find boltons?

Overkill PCM :: Overkill Motorsports ::
Diablo/CMR tunes can't modify the transmission parameters to my knowledge, which is where a big change in how the vehicle drives is made with one of my computer tunes, plus remapping the transmission line pressures and torque management which can make a big difference in the life expectancy of the transmission (stock settings are truely aweful).

For the exhaust, personally I'd get a Hogan downpipe, a ZZP 04" cat-back exhaust and have an exhaust shop modify them to fit together (or if you get a resonator-less cat-back, this is easy to do with one cut).

For intake, the stock airbox actually isn't restrictive aside from the inlet. 20 minutes with a sawzall or other cutting device and a high flow drop-in panel filter would routinely save LS4ers $200 over an aftermarket CAI.

If I had to do it all over again and went mild: Dogbone/polymount, trans cooler, shift kit, elect. cutout. If I wasn't happy with that I would of gotten a tuner that could adjust timing and put a small shot on it and be done. I do not rec Magnaflo, way too much drone!
Believe it or not before I went mod crazy, one of the biggest seat of the pants performance mod was the shift kit and dogbone/polymount. The car felt so so different after that mod.

Originally Posted by Overkill

Overkill PCM :: Overkill Motorsports ::
Diablo/CMR tunes can't modify the transmission parameters to my knowledge, which is where a big change in how the vehicle drives is made with one of my computer tunes, plus remapping the transmission line pressures and torque management which can make a big difference in the life expectancy of the transmission (stock settings are truely awful).

THIS. Torque management really kills WOT stabs, etc...I loved having higher line pressure and quicker/harder shifts...made the car feel much more "alive" if you will.

Originally Posted by Overkill

For intake, the stock airbox actually isn't restrictive aside from the inlet. 20 minutes with a sawzall or other cutting device and a high flow drop-in panel filter would routinely save LS4ers $200 over an aftermarket CAI.

THIS as well...I'm glad Will brought this up...that is what the 3800 guys used to do in the old days too...gut the box, run a straight piece of tubing from the TB to the airbox...and toss a high flow panel filter in there. Proven to work.