#211601 - 01/04/07 01:00 PM
performance mufflers
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Junior Member
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Registered: 12/13/06
Posts: 29
Loc: Columbus, OH
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Has anyone been beneath the car to look at the exhaust? I'm wanting to get some better sounding performance mufflers and keep the same stock tips (which are sweet). My 04' GTO had "true" dual exhaust (daul converters, no y-pipe, 2 pipes the whole way). Even though they ended on the same side of the car the never touched. I was just wondering if this is the same with our GXP's.
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2007 GXP Stealth Grey Metallic Best Beltronics Accelerometer Times so Far: 0-60: 5.40 1/4: 14.22 @ 98.6
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#211602 - 01/19/07 06:43 PM
Re: performance mufflers
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Junior Member
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Registered: 01/19/07
Posts: 2
Loc: Calgary,Alberta,Canada
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Try a k&N Cold Air Intake before changing your exaust.If need be try to find the Magnaflow system for the car.The only one available at this time to my knowledge.
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#211604 - 01/22/07 09:55 AM
Re: performance mufflers
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Member
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Registered: 06/08/06
Posts: 362
Loc: Topeka, Kansas
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Actually, the best bang for the buck on a GXP is to just remove the resonator. You don't really get much cabin drone at all, and any muff shop should do it for around $40.
With this, you get a deeper and somewhat louder idle, almost no change at driving speeds, and a nice surprise when at wot.
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2007 Shadow Gray Metalic GXP K&N Air Filter & More goodies to come.
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#211605 - 01/22/07 11:11 AM
Re: performance mufflers
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Junior Member
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Registered: 12/13/06
Posts: 29
Loc: Columbus, OH
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OK, thanks guys.
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2007 GXP Stealth Grey Metallic Best Beltronics Accelerometer Times so Far: 0-60: 5.40 1/4: 14.22 @ 98.6
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#211606 - 01/22/07 11:13 AM
Re: performance mufflers
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Junior Member
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Registered: 12/13/06
Posts: 29
Loc: Columbus, OH
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KansasGXP: Did you remove your resonator?
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2007 GXP Stealth Grey Metallic Best Beltronics Accelerometer Times so Far: 0-60: 5.40 1/4: 14.22 @ 98.6
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#211607 - 01/24/07 05:34 PM
Re: performance mufflers
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Member
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Registered: 06/08/06
Posts: 362
Loc: Topeka, Kansas
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Not yet, but It is scheduled to go in @ the beg. of Feb. for this. I have talked to another guy from clubgp Area47 about this. He uses the same exhaust shop as I do ( www.hoganperformance.com) and his is done. In fact, none of the guys on clubgp have said anything negative about the res. delete, other than it didn't make the car as loud as they wanted.
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2007 Shadow Gray Metalic GXP K&N Air Filter & More goodies to come.
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#211608 - 01/25/07 08:30 AM
Re: performance mufflers
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Junior Member
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Registered: 12/13/06
Posts: 29
Loc: Columbus, OH
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So they just cut the resonator out and weld in a pipe?
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2007 GXP Stealth Grey Metallic Best Beltronics Accelerometer Times so Far: 0-60: 5.40 1/4: 14.22 @ 98.6
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#211609 - 01/25/07 09:01 AM
Re: performance mufflers
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Member
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Registered: 06/08/06
Posts: 362
Loc: Topeka, Kansas
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yep, but the place that I am getting it done, will use stainless. This way, it looks just like it was supposed to be there. The pipe isn't a different color or anything.
I would just ask around at some local exhaust shops that have a good reputation. See what they say.
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2007 Shadow Gray Metalic GXP K&N Air Filter & More goodies to come.
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#211610 - 01/25/07 01:23 PM
Re: performance mufflers
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Member
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Registered: 07/15/04
Posts: 3141
Loc: Chicago, IL
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Originally posted by Kansas GXP: Actually, the best bang for the buck on a GXP is to just remove the resonator. You don't really get much cabin drone at all, and any muff shop should do it for around $40.
With this, you get a deeper and somewhat louder idle, almost no change at driving speeds, and a nice surprise when at wot. Think you could record some audio for us?? I would really love to hear it!
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DHP V1.0, Slotted rotors, S/S Brake Lines, Custom CAI, GMPP Handling Kit, KYB's, Jimmy C DP (U-Bend delete w/ Hi-flow cat), Flowmaster Super 40's, drilled 180° T-Stat, Alt. Rewire & Alt. Voltage Booster Combo, 605's, ZZP Motor Mounts
"The only difference between me and a madman is that I am NOT mad!" - Dali
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#211612 - 01/29/07 08:05 AM
Re: performance mufflers
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Junior Member
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Registered: 12/13/06
Posts: 29
Loc: Columbus, OH
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Got the resonator taken off on Saturday (Mieneke 60 bucks). Definitely has a lower exhaust note especially when starting the car and under accelation. No difference when going constant speed.
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2007 GXP Stealth Grey Metallic Best Beltronics Accelerometer Times so Far: 0-60: 5.40 1/4: 14.22 @ 98.6
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#211613 - 01/29/07 11:25 AM
Re: performance mufflers
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Member
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Registered: 06/08/06
Posts: 362
Loc: Topeka, Kansas
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Yep, No difference @ a constant. Did you notice the difference @ WOT?
I sure did. I think T-Bat is correct about the Flow's. I might look into some for the car, but I definitly don't want anything as loud as my truck is, or my T/A was.
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2007 Shadow Gray Metalic GXP K&N Air Filter & More goodies to come.
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#211614 - 01/29/07 11:45 AM
Re: performance mufflers
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Junior Member
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Registered: 12/13/06
Posts: 29
Loc: Columbus, OH
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Oh yeah, pretty big difference at WOT. It is loud enough for me now, actually SOUNDS like a V-8 now! Like you said, I don't want it to sound loud and obnoxious like some trucks/mustangs/TA's you see. I'd rather take the money I'd put into Flows and look into some kind of cold air intake system (if they make them).
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2007 GXP Stealth Grey Metallic Best Beltronics Accelerometer Times so Far: 0-60: 5.40 1/4: 14.22 @ 98.6
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#211615 - 01/30/07 08:46 AM
Re: performance mufflers
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Member
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Registered: 06/08/06
Posts: 362
Loc: Topeka, Kansas
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There is a K&N CAI you can buy, but honestly, make it yourself. Just by the 7" cone from K&N, and build your own fwi.
There are a bunch of ideas floating around on this site, just do a search for homeade CAI or FWI.
There is also a nice write up on an insulated FWI on ClubGP. Do a search for "My new intercooled air intake" posted by Mr.Man.
It has a great write up, with pics on how to do this, and seal it off from your engine bay.
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2007 Shadow Gray Metalic GXP K&N Air Filter & More goodies to come.
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