My L99 Custom Exhaust with Pics - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Tomato · 10-07-2009, 10:15 PM

I tried the muffler delete, but the AFM drone was killing me. Actually put the damn mufflers back on, but that, as you know, is just way too quiet. Went to my shop today and took a chance. We cut the old exhaust off just behind the cats, and did our own cat-back system. I used a pair of Magnaflows in place of the weird-a$$ single/giant muffler/resonator that's towards the front of our cars (pic attached of that thing, too). Test drove it like that, but there was a bad drone. Added "generic" glass-packs where the old mufflers were, and PURRFECT! A slight drone when AFM kicks in, but not bad at all. Oh yeah - also added an X-pipe just behind the cats.

Weird thing about the big, center muffler is that it is basically straight through on each side - no baffles and no cross-overs. Must be to just deaden sound. Placing the Magnaflows where we did had the same effect inside the car.

I discovered, too, that you can "defeat" the AFM at highway speeds by using the paddle shifters. I always thought you had to stay down a gear, but I discovered that once you use the shifters, you can go back to 6th and NO AFM!!!!!!! I just had my re-flash today for the HVAC system, but I don't think this had anything to do with it. Mechanic told me there were no other updates.

Let me know what you think.

MaroSS · 10-07-2009, 10:30 PM

SOUND CLIPS!!!!

kelleyperformance · 10-07-2009, 10:58 PM

looks nice!

wow that resonator is weird as hell... i think the LS3 is quiet, can only imagine the L99 with that huge thing feeding into even bigger mufflers lol

stryker755 · 10-08-2009, 10:05 PM

Looks sweet, but what do you have running out the back? Looks like an axle back kit with the wider tailpipes as opposed to normal muffler delete with custom bent tails?

Tomato · 10-08-2009, 10:41 PM

Those are actually the "generic" glass pack mufflers. Only 12" long and straight through, but they are packed around the core. They made a significant difference in reducing the drone and resonance. Ran those as part of the custom bent tailpipes.

The funny thing is that the stock exhaust is basically straight pipe. That giant muffler in the middle is straight through with a few bends, and the stock mufflers are straight through, but with a bend and a lot of inlets for gases/sound...You would think they would have built in a crossover into the center muffler, but they did not. That said, if I gained any power, it was because of the X-pipe.

eddie SS · 10-09-2009, 10:11 AM

Sound clip would be sweet....

10-07-2009, 10:15 PM	#1
Tomato G-Force Addict Drives: 2010 SS/RS A6 Join Date: Jul 2009 Location: Escalon, CA Posts: 196	My L99 Custom Exhaust with Pics I tried the muffler delete, but the AFM drone was killing me. Actually put the damn mufflers back on, but that, as you know, is just way too quiet. Went to my shop today and took a chance. We cut the old exhaust off just behind the cats, and did our own cat-back system. I used a pair of Magnaflows in place of the weird-a$$ single/giant muffler/resonator that's towards the front of our cars (pic attached of that thing, too). Test drove it like that, but there was a bad drone. Added "generic" glass-packs where the old mufflers were, and PURRFECT! A slight drone when AFM kicks in, but not bad at all. Oh yeah - also added an X-pipe just behind the cats. Weird thing about the big, center muffler is that it is basically straight through on each side - no baffles and no cross-overs. Must be to just deaden sound. Placing the Magnaflows where we did had the same effect inside the car. I discovered, too, that you can "defeat" the AFM at highway speeds by using the paddle shifters. I always thought you had to stay down a gear, but I discovered that once you use the shifters, you can go back to 6th and NO AFM!!!!!!! I just had my re-flash today for the HVAC system, but I don't think this had anything to do with it. Mechanic told me there were no other updates. Let me know what you think. Attached Images

10-07-2009, 10:30 PM	#2
MaroSS ZL1 Drives: 10' SS/RS - Sold; 15' White ZL1 Join Date: May 2009 Location: Harbor City, CA Posts: 683 View My Garage	SOUND CLIPS!!!! __________________

10-07-2009, 10:58 PM	#3
kelleyperformance Drives: DD- 15' Chevy SS Sedan Join Date: Oct 2009 Location: Ft. Lauderdale Posts: 233	looks nice! wow that resonator is weird as hell... i think the LS3 is quiet, can only imagine the L99 with that huge thing feeding into even bigger mufflers lol __________________

10-09-2009, 10:11 AM	#6
eddie SS ALWAYS A MARINE......!!! Drives: 2010 camaro IOM/2SS/RS/sunroof Join Date: Aug 2009 Location: Brooklyn, New York Posts: 268 View My Garage	Sound clip would be sweet.... __________________ She's finally home: 09/18/09 Mods so far: SOLO Performance MACH XL cat-back exhaust, NOWEEDS exhaust diverters, Tinted windows, gas cap decal, bow tie black outs, Cold Air Inc CAI, Eibach Pro kit lowering springs Mods I have but not installed yet: rear trunk black out, Diablosport Trinity Future Mods: ARH long tube w/ high flow cats or Dynatech's SuperMaXX long tube w/ high flow cats, Maggie S/C

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Custom paint pics???	SweetPea	4th Generation Camaros	3	10-06-2009 07:49 PM
Best Exhaust Option For L99???	chevymuscle311	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	32	09-16-2009 01:46 PM
L99 2SS/RS Exhaust "Popping" on Start...	y2jdmbfan	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	9	07-22-2009 02:58 PM
2SS/RS L99 exhaust note...pics and vid	Hebe4	Camaro Photos \| Spyshots \| Video \| Media Gallery	19	03-28-2009 01:04 PM

10-08-2009, 10:05 PM	#4
stryker755 Drives: 2013 ZL1 Vert AGM Join Date: Apr 2009 Location: Michigan Posts: 319	Looks sweet, but what do you have running out the back? Looks like an axle back kit with the wider tailpipes as opposed to normal muffler delete with custom bent tails?

10-08-2009, 10:41 PM	#5
Tomato G-Force Addict Drives: 2010 SS/RS A6 Join Date: Jul 2009 Location: Escalon, CA Posts: 196	Those are actually the "generic" glass pack mufflers. Only 12" long and straight through, but they are packed around the core. They made a significant difference in reducing the drone and resonance. Ran those as part of the custom bent tailpipes. The funny thing is that the stock exhaust is basically straight pipe. That giant muffler in the middle is straight through with a few bends, and the stock mufflers are straight through, but with a bend and a lot of inlets for gases/sound...You would think they would have built in a crossover into the center muffler, but they did not. That said, if I gained any power, it was because of the X-pipe.