LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

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Old Apr 11, 2013 | 07:10 PM
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Hey all!
Finally got my first LS powered car. I've been wanting a manual 05 or 06 GTO for years but since I needed a 'family' car for me, the wife and kids, I bought a used, very responsible, non hotrod Grand Prix GXP.
Man I love this car! Comfy and loaded up but plenty of power, handling and some serious stopping power. How did I live with out this???

So, now I need to fix some little things and start hopping this thing up. What are some of the quick and easy mods that can be done with this car?
Thanks.
Mike
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Old Apr 11, 2013 | 07:27 PM
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Air box mod. Free with a dremel.
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Old Apr 11, 2013 | 08:13 PM
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Welcome! I pick up a 2006 GXP tomorrow, it'll be mainly the wife's car. I already have a modded GTO.

The best bang for the buck for GXPs are ZZP downpipe, better air intake, and tune.
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Old Apr 11, 2013 | 08:21 PM
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Originally Posted by boneheadzz
Hey all!
Finally got my first LS powered car. I've been wanting a manual 05 or 06 GTO for years but since I needed a 'family' car for me, the wife and kids, I bought a used, very responsible, non hotrod Grand Prix GXP.
Man I love this car! Comfy and loaded up but plenty of power, handling and some serious stopping power. How did I live with out this???

So, now I need to fix some little things and start hopping this thing up. What are some of the quick and easy mods that can be done with this car?
Thanks.
Mike
Flip the motor mount. It's free and makes a difference. Then id say exhaust intake Tranny cooler and a tune.
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Old Apr 11, 2013 | 10:34 PM
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Cold Air Inductions cold air intake, and a tune!

I can hook you up with both!
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Old Apr 12, 2013 | 11:33 AM
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Originally Posted by baltsk8er69
Air box mod. Free with a dremel.
What part of the airbox should be cut out? Don't want to swiss cheese the thing unless its worth it and its not totally visible from the top.
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Old Apr 12, 2013 | 11:43 AM
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You can buy a k&n drop in and do this
https://ls1tech.com/forums/ls4-performance/1187683-modified-gxps-air-box.html
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Old Apr 12, 2013 | 11:58 AM
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Originally Posted by baltsk8er69
You can buy a k&n drop in and do this
https://ls1tech.com/forums/showthread.php?t=1187683
Was there a noticeable difference after this swap?
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Old Apr 12, 2013 | 12:23 PM
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No. But it sounds better lol. That was very ricer. The issue with ls4s is the underhood temps. So just don't use a short ram intake.
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Old Apr 12, 2013 | 01:35 PM
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shift kit for 40-70 bucks. Extremely easy, I have no mechanical ability and was able to do it. and some magnets for the transmission fluid pan. Probably need to change the fluid anyway. Use dexron VI for the fluid. If you want to add some pep probably just get a diablo intune and use the built in tune.

This car takes 93 fuel, don't use 87. If you didn't know that ahead of time, sorry.

Aftermarket parts, I can recommend the Cold Air Inductions intake. I got mine from diablewtune.com. The guy who runs it actually already posted in this thread too. The cheapest you will find it is on his site. He can also do custom tunes with him, I think I might get started on that today or this weekend. Not too far you can go with mods though without doing some real tranny work though, and that gets pricey. Not sure what you are looking to do there.
You can flip the motor mount as well, but I can't say I noticed too much of a difference.
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Old Apr 12, 2013 | 03:08 PM
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Originally Posted by 06MonteSS
Cold Air Inductions cold air intake, and a tune!

I can hook you up with both!
Isn't that just the luck lol
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Old Apr 14, 2013 | 12:34 AM
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Has someone done a tutorial on the motor mount flip? I kinda eyeballed it earlier and I don't see how its flipped around. Looks like a fork on one end and a bushing on the other. I'm guessing its the upper mount everyone flips?
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Old Apr 14, 2013 | 01:03 AM
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Originally Posted by boneheadzz
Has someone done a tutorial on the motor mount flip? I kinda eyeballed it earlier and I don't see how its flipped around. Looks like a fork on one end and a bushing on the other. I'm guessing its the upper mount everyone flips?
Yep that top one, what I did was take that bolt out, then spray some lube IE wd40 into the square rubber mount. Then stick the bolt in there and torque the nut on it. Then take your rachet and wrench and turn them both the same way and it'll roll over. Then put your mount back in and there you have it! You might have to pull your motor forward like I did. That was annoying!
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Old Apr 14, 2013 | 01:06 AM
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It's a 15mm bolt and nut too
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Old Apr 14, 2013 | 01:48 AM
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Just get a poly mount and be done with it.
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Old Apr 14, 2013 | 09:37 AM
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I see zzp has some mounts for the 3800 that some people use on their 5.3 cars. Anyone else making these poly mounts?
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Old Apr 14, 2013 | 12:29 PM
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Zzps would be easier to install I think there a 2 piece design bushing intense-racing.com has one piece ones but there a little more challenging to install. Use some type of grease and a hammer to get that bushing in
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Old Apr 14, 2013 | 09:29 PM
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Originally Posted by baltsk8er69
You can buy a k&n drop in and do this
https://ls1tech.com/forums/showthread.php?t=1187683
Hey its nice to see my Old post under my old screen name is helping people... I thought I had messed up that old S/N... I guess I should try to log into that one again
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