need some help with exhaust - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

cipriank · 07-30-2013, 07:38 AM

I have a l99 with slp longtubes and high flows. I will be installing an Ls3 STOCK Catback to cut down on cabin noise. Will I lose any performance removing my aftermarket exhaust.?

nyrfan · 07-30-2013, 07:51 AM

Quote:

Originally Posted by cipriank

I have a l99 with slp longtubes and high flows. I will be installing an Ls3 STOCK Catback to cut down on cabin noise. Will I lose any performance removing my aftermarket exhaust.?

Installing an LS3 catback will not cut down cabin noise, if anything it "may" enhance it a bit since you are losing the resonator. Either way I cannot see how you think there is cabin noise with the stock system.

But no, there would be no performance loss.

Sent from my 2SS/RS

Apex Motorsports · 07-30-2013, 07:51 AM

You won't lose any power but you will add some weight. A stock LS3 cat back probably won't do anything for interior sound.

cipriank · 07-30-2013, 08:14 AM

I have a magnaflow resonated x pipe with dynomax bullets now and its very loud. Thats why I was trying to cut down on noise

f5journal · 07-30-2013, 08:27 AM

Well, I might have to disagree somewhat here. I just installed Kooks LT's and their hi flow cats and left the stock cat back alone. I see no difference in cabin noise at any normal driving mode. It is way louder under heavy throttle, but nice and tame normally. I love it. Mine is LS3 though

Now if you are changing stock L99 for stock LS3, you are going in the wrong direction, LS3 is louder. I'm assuming you are removing an aftermarket system

Birm · 07-30-2013, 08:36 AM

Get rid of the Dynomax bullets and get the Dynomax VT Axleback..... Interior noise will then be nill. Or add J-Pipes to your Bullets, run about 150 and well worth the money.

As far as performance, your exhaust is simply for sound...the performance gains/losses are typically attributed to the difference in weight.

LS3 Stock vs your current X-Pipe and Bullet Mufflers WILL be quieter...

nyrfan · 07-30-2013, 08:47 AM

Quote:

Originally Posted by cipriank

I have a magnaflow resonated x pipe with dynomax bullets now and its very loud. Thats why I was trying to cut down on noise

Ah, I thought you were going stock to stock.

cipriank · 07-30-2013, 08:48 AM

Quote:

Originally Posted by f5journal

Well, I might have to disagree somewhat here. I just installed Kooks LT's and their hi flow cats and left the stock cat back alone. I see no difference in cabin noise at any normal driving mode. It is way louder under heavy throttle, but nice and tame normally. I love it. Mine is LS3 though

Now if you are changing stock L99 for stock LS3, you are going in the wrong direction, LS3 is louder. I'm assuming you are removing an aftermarket system

I am removing an aftermarket system and have afm tuned out so I suspect the ls3 catback will give me a decent sound. any sound clips ?

07-30-2013, 07:38 AM	#1
cipriank Drives: 2010 camaro 2ss Join Date: Feb 2011 Location: boca raton, fl Posts: 247	need some help with exhaust I have a l99 with slp longtubes and high flows. I will be installing an Ls3 STOCK Catback to cut down on cabin noise. Will I lose any performance removing my aftermarket exhaust.? __________________ 2010 2ss L99 Mods: ADM race intake, ADM scoop w/ washer bottle, SLP long tube headers, SLP 25% UDP, SLP Loud Mouth 2 exhaust, Vmax TB, BER intake manifold,3.45 gears, MSD wires, SLP 160 t-stat, SLP Springs, EFI live tune by Redline Motorsports

07-30-2013, 08:14 AM	#4
cipriank Drives: 2010 camaro 2ss Join Date: Feb 2011 Location: boca raton, fl Posts: 247	I have a magnaflow resonated x pipe with dynomax bullets now and its very loud. Thats why I was trying to cut down on noise __________________ 2010 2ss L99 Mods: ADM race intake, ADM scoop w/ washer bottle, SLP long tube headers, SLP 25% UDP, SLP Loud Mouth 2 exhaust, Vmax TB, BER intake manifold,3.45 gears, MSD wires, SLP 160 t-stat, SLP Springs, EFI live tune by Redline Motorsports

07-30-2013, 08:27 AM	#5
f5journal Senior Camaro Fanatic Drives: 2011 SS/RS manual - White Join Date: Aug 2010 Location: aiken, sc Posts: 1,980	Well, I might have to disagree somewhat here. I just installed Kooks LT's and their hi flow cats and left the stock cat back alone. I see no difference in cabin noise at any normal driving mode. It is way louder under heavy throttle, but nice and tame normally. I love it. Mine is LS3 though Now if you are changing stock L99 for stock LS3, you are going in the wrong direction, LS3 is louder. I'm assuming you are removing an aftermarket system __________________ Former '68 and '69 Z/28 Owner...........Now sporting around in a 2011 RS/SS with........Kooks LT's and cats, JRE tune, CAI, scoop, ZL1 Bumper conversion, custom ZL-1 grille, halo harness, Painted silver stripes, GM GFX, black painted lower edge of skirts and rear bumper. MGW shifter.....and now a 3.91 1LE diff

07-30-2013, 07:51 AM	#3
Apex Motorsports Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 25,179	You won't lose any power but you will add some weight. A stock LS3 cat back probably won't do anything for interior sound.

07-30-2013, 08:36 AM	#6
Birm Drives: Florida Speed & Power Join Date: Jan 2011 Location: Pinellas Park, FL Posts: 3,185	Get rid of the Dynomax bullets and get the Dynomax VT Axleback..... Interior noise will then be nill. Or add J-Pipes to your Bullets, run about 150 and well worth the money. As far as performance, your exhaust is simply for sound...the performance gains/losses are typically attributed to the difference in weight. LS3 Stock vs your current X-Pipe and Bullet Mufflers WILL be quieter...