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

you could easily make your own intake with some pvc pipe and a nice big open cone. For a tuner some people use Reptile who is a member on here or some people go through zzp.

that's kind of a waste of time considering he has a GXP and needs a whole slew of different parts that you cannot source from a 3800 build thread. try again.

K&N's intake has actually been proven pretty well for the GXP. It also depends on your budget and where you want to take the car. There are a few catback options, just search for them...Borla, Magnaflow, SLP...etc. Hogan makes a 3" Downpipe or Doug Thorley makes headers for the LS4 cars. People have also used various hand held tuners too, but best results will be yielded from HP Tuners...There are LSx rockers, LSx based cam swaps, LSx intake manifold and TB swaps along with the correct fuel rails, etc. Displacement on Demand will most likely need to be deleted to run an aftermarket cam. You can buy solid rubber replacement lower motor and transmission mounts and a poly upper mount for hold it all in place too.

You should be able to get mufflers at any shop, I got my flowmasters from a hole in the wall shop. Went with dual chamber 40's to start with and had them several months but werent aggressive enough so went with single chamber 10's now. But im bettin the most ppl will tell you magnaflow

Universal Magnaflows with 3 1/2" dual tips. Fills in rear bumper cut outs well.. Sound is incredible. Deep...

Originally Posted by bluegtp91

K&N's intake has actually been proven pretty well for the GXP. It also depends on your budget and where you want to take the car. There are a few catback options, just search for them...Borla, Magnaflow, SLP...etc. Hogan makes a 3" Downpipe or Doug Thorley makes headers for the LS4 cars. People have also used various hand held tuners too, but best results will be yielded from HP Tuners...There are LSx rockers, LSx based cam swaps, LSx intake manifold and TB swaps along with the correct fuel rails, etc. Displacement on Demand will most likely need to be deleted to run an aftermarket cam. You can buy solid rubber replacement lower motor and transmission mounts and a poly upper mount for hold it all in place too.

This is all some good info. If you are looking for a custom tune go over to ls1tech and search for 06MonteSS. He does custom tunes with the diablosport tuner. Guys like what he does.

Here is his email

06MonteSS@diablewtune.com

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.

Originally Posted by Carpepoon

Do you have a link or model #?

JustMagnaflow.com - An Authorized Maganflow Dealer

The price has gone up since i last bought them. I paid $300 for both. Cat-Back wasn't availible yet.

Sound clip of my car:
More Grand Prix Stuff :: GXP Magnaflow Mufflers video by draukenrue - Photobucket

FTW.....
YouTube - Grand Prix GXP exhaust