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GXP Exhaust. Ordering parts but have questions



marines542 said:
havent been able to find anyone else who makes a good one for the gp gxp
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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!
 
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

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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
 
extremely nice gxp! i dont have money for a turbo but after exhaust and the overkill tune thats probably all im gonna do to it performance wise for awhile. I'm waiting to do my exhaust until the new headers get released for purchase. Their alot cheaper than DT's and from what ive read better. Then im gonna do 3 inch to the y split then go down to 2.5iche to the mufflers. the tips are gonna be 2.5 inlet and 3.0 outlet. but 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 ?
 
marines542 said:
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 ?
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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
 


didnt wanna start a new thread for another sorta exhaust related question so im posting to my other thread.
the new headers that are supposed to be released for the 5.3 have a spot predrilled for a wide band 02 sensor. Should i get that sensor? if so where from and what all is required to use it like its supposed to be used. I have a set of ecm/tcm's that im buying off someone from gmls4.com and im going to send them back to overkill to be reprogrammed for my car and for 91+ octane. do i need to tell him im getting a wide band?
 
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
 
91parkave said:
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
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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

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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.
 
who told you your ECM wasnt tunable? HP Tuners EFI live and Diablow, and trifecta support your vehicle. i own a 06 GXP myself and use hp tuners but also owned the diablow unit. and sorry about the location mixup but regardless a dyno tune will do wonders as compared to a canned tune.
 


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

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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

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