Thread: Just got a GTP, have a few questions for the experts

overkill is a vendor on here. check out the vedor section.

Originally Posted by blowfishRus6

overkill is a vendor on here. check out the vedor section.

K found it thanks. So this guy tunes to your specific setup? What kind of turn around time have you guys been seeing with him?

Originally Posted by LSXHP

K found it thanks. So this guy tunes to your specific setup? What kind of turn around time have you guys been seeing with him?

dont know about turn around time. i did buy my rockers from canada (which will told me about) and had them in about 4-5 business days.

yes overkill tunes specifically to your mods.

Just wait on the pulley...get the PCM...and get some plugs and wires too...

Originally Posted by bluegtp91

Just wait on the pulley...get the PCM...and get some plugs and wires too...

Car dont need wires, only got 64xxx on the clock, I have read many of places and from many shops the factory wires are the best on these type of ign setups on GM cars. As for the plugs thats a given with the pulley I figured. Pulley,plugs and pcm will all be installed as 1 mod.

Originally Posted by LSXHP

I have read many of places and from many shops the factory wires are the best on these type of ign setups on GM cars.

It's debatable. Plus if you're putting plugs in good luck taking stock wires off and on...most of the time they rip and you're forced to get new ones anyway...I just look at it as if you're there and you can, why not upgrade. And as for the ignition...it is the coil packs. They are very good from the factory and the MSD Blaster Coils "apparently" show a decrease in HP on a dyno but I don't buy it...I just bought them for the name and the eye candy.

Overkill's turn around time is about a week, maybe slightly longer.

and hes new version 4 is now editable by HP tuners.

OK...so I just put that down pipe on and 2 things....1. it feels like its touching the body of the car when I first accelerate and when I floor it, I can feel it whats the fix for that? Very annoying. 2. I dont like how the exhaust sounds it got louder and sounds like a beater lol kinda like an old 3.1 corsica I had for a work beater back in the day with no muffler just not as loud, how can I quiet it back down to near stock noise levels??

it is probably hitting your sway bar. flip it over. if it is hitting the bottom of your car youre going to have to use some persuasion on the bottom of the car with a hammer.

if you have a stock exhaust there really isnt much more you can do to quiet it down.

Originally Posted by Bio248

it is probably hitting your sway bar. flip it over. if it is hitting the bottom of your car youre going to have to use some persuasion on the bottom of the car with a hammer.

if you have a stock exhaust there really isnt much more you can do to quiet it down.

I didnt think it was touching anything.....but if it takes some cinvincing to get the bottom of the car to move then so be it lol Now what if I add a high flow cat or another resinator like a straight through one that wont obstruct exhaust flow, think that would quiet her down?

Originally Posted by LSXHP

I didnt think it was touching anything.....but if it takes some cinvincing to get the bottom of the car to move then so be it lol Now what if I add a high flow cat or another resinator like a straight through one that wont obstruct exhaust flow, think that would quiet her down?

If you still have the stock resonator then there isn't much you can add but a cat...but if you do that there is still a chance that it will throw a code too as the PCM sometimes won't recognize a high flow converter.

Originally Posted by bluegtp91

If you still have the stock resonator then there isn't much you can add but a cat...but if you do that there is still a chance that it will throw a code too as the PCM sometimes won't recognize a high flow converter.

i have a 2.5" high flow cat and my car is fine. doesnt throw a code.

yeah, another resonator might be helpful. or you could take out your stock one and replace it with a new one. could be that it is old and worn out.

it shouldent get much louder with a downpipe. did you get the gasket in it good and all sealed up??

Originally Posted by blowfishRus6

it shouldent get much louder with a downpipe. did you get the gasket in it good and all sealed up??

Ya know what.....I had an exhaust shop I use put it in because my garage is full with other crap right now, and I noticed gaskets sitting on there floor in the bay my car was in, I thought nothing of it until now, it does sound like a leak from the bottom of the car now that I listen down there!! Thos fu***** morons probably didnt put the gasket on like I told them too I'm goni right back down there here in a few min, there open on sunday and I'll see if thats the problem.

When I put on my cat'd downpipe, mine didn't get louder but the sound became more "detailed" if that makes sense. It was an improvement.

I have no resonator with a couple Magnaflow XL mufflers.

Originally Posted by superv6

Damn this thread got long. Lol! Hey bio does that happen a lot with dps when it clanks on the sway bar? I never really payed attention but mine might b doin that. U say u can flip the sway bar over? Will that cause the car to notice a knock and add kr?

yeah, it happens fairly often with bigger exhaust parts. i flipped mine when i first did headers and never had a problem. if it is hitting youll see a spike of knock when you first stab the throttle and then it will go away pretty quickly depending upon your decay rate settings. flipping it should let you clear the added size of anything you can throw at it.