Pontiac Grand Prix Forums : Grandprix

im sure its been said before.... but i want to delete my resinator and cat and u bend all at 1 time i dont think my GTP is going to see headers so i just want to be unique and run with my idea. can i get a piece of pipe drill out a hole for the 02 sensor and weld a bung in it or have a shop weld a bung on w.e. anyways my question is what would be the recomended sizes of length and inlet outlet size ? i want to get a raspy LOUD noise lmao thats the plan haha. will this work any tips? how much you think it would cost? do you really gain HP and better flow? thanks

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hogan 3inch DP u bend delete 02 delete ,180*tstat, autolite 104s, LED interior, FWI, 2000watt system, bullitt rims, zzp pistons, pems, alt rewire, thrush muffs, 3.4 zzp mps, transgo shift kit, triple edge performance trans. autometer triple pod got 3800?

id just get a 3" downpipe without a cat and then delete the resonator all at the same time.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

THINKIN CHEAP! lol

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hogan 3inch DP u bend delete 02 delete ,180*tstat, autolite 104s, LED interior, FWI, 2000watt system, bullitt rims, zzp pistons, pems, alt rewire, thrush muffs, 3.4 zzp mps, transgo shift kit, triple edge performance trans. autometer triple pod got 3800?

x2 cat-less dp.

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99 GT- L36:GenV:N*:1.9 rollers:Pacesetters:slp catback:3ep trans:Intense Input shaft:stock pulley
BPC member

y would u want it raspy?

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for the power gain youre going to get from the cat and resonator delete it really doesnt justify how nasty it is going to sound.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

Come on, look who is asking.........

Just leave the cat on, have the muffler shop tack in a 2.5" pipe from the end of the cat to the bend at the gas tank. And have them drop in an O2 Bung for the sensor. Should only run about $100-150 bucks. Good luck with the droan you are gonna have in your car now too.

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James Shafer
2003 GP GTX SLP P/N 50066
St. Louis MO
1.9 Modified Rockers, TOGs, 180 Tstat, PRJ 10.4 Wires, P/P Gen 3, SLP Ram Air Hood/Wizaired CAI, Gen 1 Spoiler, 3.4 ZZP Pulley, Desert Fox Tranny Cooler, Thrasher Shift Kit, 18" TSW Mondellos w/ AGX Struts, SSC Gen II Springs

that poor gtp

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99 GT- L36:GenV:N*:1.9 rollers:Pacesetters:slp catback:3ep trans:Intense Input shaft:stock pulley
BPC member

ok ill leave it alone haha

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hogan 3inch DP u bend delete 02 delete ,180*tstat, autolite 104s, LED interior, FWI, 2000watt system, bullitt rims, zzp pistons, pems, alt rewire, thrush muffs, 3.4 zzp mps, transgo shift kit, triple edge performance trans. autometer triple pod got 3800?

if u want to do anything. and be cheap about it. just delete your ubend!

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I'd say 3" DP (cat in or out its up to you)

Have the shop make a U-Bend Delete...mine did it for $50...and I'd leave the res. Taking out the cat/u-bend and installing a DP will more than make enough sound Taking out the resonator makes it sound like epic dog s**t

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2003 Blue-Black Metallic GTP Sedan - Almost Done...
2007 Gold Mist Chevrolet Cobalt LT - Custom CAI, NGK V-Power's, Muffler Delete, Custom Tuned PCM...Sure does have every bit of 130 FWHP
http://www.cardomain.com/id/03blueGTP

yeah i thinkk imma delete the U and ressy good idea guys?

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hogan 3inch DP u bend delete 02 delete ,180*tstat, autolite 104s, LED interior, FWI, 2000watt system, bullitt rims, zzp pistons, pems, alt rewire, thrush muffs, 3.4 zzp mps, transgo shift kit, triple edge performance trans. autometer triple pod got 3800?

keep the res.

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I understand where you're coming from but really, there is a reason the resonator is in there and trust all of us, you won't like your resulting exhaust. There are plenty of suggestions above for getting a louder exhaust while still maintaining sanity

lol ok =] lol what if i replace the ressy with a cherry bomb? lol

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hogan 3inch DP u bend delete 02 delete ,180*tstat, autolite 104s, LED interior, FWI, 2000watt system, bullitt rims, zzp pistons, pems, alt rewire, thrush muffs, 3.4 zzp mps, transgo shift kit, triple edge performance trans. autometer triple pod got 3800?

my resonator is a 24" glasspack from summit.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

What performance upgrade do you get from a glasspack instead of the fact resonator? what kind of sound difference? is it a 3" or 2.5?

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Thrasher cai, s&b 9",zzp stainless power log, zzp 3" cated dp, :180*t stat, autolite 104's, overkill pcm,: thrasher 3.4 modular pulley,F&R drilled/slotted rotors. 245/45/18 Fierce on Casino's

it sounds different. i run a 2.5" because there is no reason to run a 3" exhaust on an m90 car. it sounds more throaty and doesnt make such a nasty exhaust note up top, but it still sounds like garbage.

i have stock mufflers, by the way.

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

will at overkill suggested that I get a 3" cat back to go with the rest of my mods, then pcm modification. I have the plog and 3" dp with cat. I am not sure if I want the 3" cat back. I will be sending out for the pcm in a couple of weeks, because I do not drive the car in the winter, so not in a hurry. any suggestions about the cat back? I did not think it was necessary.

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Thrasher cai, s&b 9",zzp stainless power log, zzp 3" cated dp, :180*t stat, autolite 104's, overkill pcm,: thrasher 3.4 modular pulley,F&R drilled/slotted rotors. 245/45/18 Fierce on Casino's

catback is not necessary, i put mine on for sound, and then switched back to stock mufflers because i hated the sound. my set up now is TOG's, ZZP TOG DPcatless, dynomax res, to stock mufflers. its louder inside because of the headers but thats just what headers will do for you