Thread: GXP Exhaust. Ordering parts but have questions

$234 is an aweful high price for a downpipe.

Originally Posted by marines542

havent been able to find anyone else who makes a good one for the gp gxp

I was going to say Hogan, but looks like they don't make them anymore. Not sure if you are familiar with this site, but they do sell LS4 goodies or redirect you where to buy them...

LS4 Store

Holy expensive headers!

Could always find an exhaust shop to cut and bend you some pipe.

Yea I know that's where I look a lot and for headers there's a company that just released the first set for testing and their a little over 300 for a set. I'm waiting to order when they start selling

Sent from my pager using Morse code. ... .. ... ....

on the cutout side, you can control how loud you want it to be. if you place the cutout b4 the cat ( if there is one) then ur talkin pretty dam loud, or if you put it after the cat its sounds more like the new 5L mustang ish haha i have a cutout b4 and after the cat so i can switch it up every once in a while.

here is what she sounds like with cutout b4 the cat open
Turbo Grand prix GXP - waterless washed, waxed, and short video - YouTube

i have a few more video's around on my comp of a in car drive like that.
if u got any questions lemmie know

You can follow this thread. Seems like they are close to being done.

UPDATED 11/1/2012: LS4 Headers from CalSpeed Coming Soon! - LS1TECH

Originally Posted by marines542

a cutout will be coming soon as well and when you say you put yours before the cat...can you take a pic when you get a chance of where at ?

yes i sure can will be a little hard atm car is put away but ill see what i can do. and my exhaust is custom 3inch to the y then 2.5 aswell

Originally Posted by 91parkave

If youre not going to do any tuning youreself, then dont bother with a wideband. wideband is for accuartley monitoring air/fuel/ratio. Also i wouldnt bother with the overkill tune as will support in the u.s is very sporatic and in general unreliable. if i were you id get a dyno tune locally, especially since youre in cali. here is the link to the wideband btw AEM Performance Electronics - All Software & Firmware Downloads

Well for 1 I'm not in California I'm in north Carolina and 2 the ecm isn't tunable in my car if have to get a ecm/tcm from junk yard and three the only dyno within a 2 hour drive charges way to sang much compare to others. They charge 150 just to weld mufflers and tips on. That's if u supply the new mufflers and tips and already have the old cut out. Plus from what I've read overkill does great ls4 tunes and I'm not planning heavy mods anytime soon. And I haven't had a hard time getting into touch. He replays with two days of when I send an email and that includes weekends. But thanks for answering the wideband question. I didn't know what their use was for

Sent from my DROID RAZR using Tapatalk 2

Yea his tunes are good. Wideband won't be needed unless you get a dyno tube or better yet a in car tune..right now don't spend the money.

I was reading that mine wasn't tunable...even Google's it but the threads I read were old so I'm guessing the timers have improved since then lol

Sent from my DROID RAZR using Tapatalk 2

IIRC took Will awhile to start making Tunes available for the GXP.

trust me its tune-able.. and i dont believe a wideband is needed, i use one but thats to keep an eye on fuel-air ratio with turbo. if u ever mod the engine at least its there

OK good to know its tunable but I don't have the experience to tune so I'm just gonna stick with over kill. I haven't heard of a case relearn problem at dealerships before so I'll take my chances

Sent from my DROID RAZR using Tapatalk 2