Long tube headers installed! Now what? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

timmer · 04-02-2024, 08:28 PM

Well my TSP long tube headers are installed and car is tuned! Only 1 minor issue. I had flowmaster exhaust on it before. I didn’t want it too loud so on the shops advice I put factory exhaust from high flow cats back. I didn’t realize that this exhaust came from a convertible which means L99 not LS3 which means large resonator in front. The shop says this is robbing me of approximately 10-15 whp. What are my options? Cut the resonator out? Get and X or H PIPE? Do a different cat back system? Thank you!

acutron42 · 04-02-2024, 08:57 PM

I think that 10-15 is a high number.

tartagliazl1 · 04-03-2024, 06:33 AM

Jegs has a nice 409 stainless x pipe for the camaro. Easy to install also.

The_bald_eagle_machine · 04-03-2024, 08:49 AM

One of the best sounding cat backs for these cars is the Corsa system... The Borla Atak system is also really nice. These are easy(everything in the box) type systems. But if the car is at an exhaust shop, why can't they just mock up a system for you?

1JEWLDSSRS · 04-03-2024, 11:41 AM

^^^ As stated above, if the car is at the shop, if they know what they are doing, they can cut the big resonator out and fab up an x of h pipe for you, and be done with it. If not, then Summit Racing sells a "Tru-Flow" non resonated x pipe, I had one before I went to the Corsa cat back..

https://www.magnaflow.com/products/1...t-x-pipe-10791

TheBrightSide · 04-18-2024, 05:11 AM

Super easy to have any exhaust shop cut out the huge factory resonator, and weld in a generic x-pipe, with extra piping to offset it to your liking/preference. I don’t know where the best place or what dimensions of x-pipes would be best, although I do know that certain brands like BBK and Borla, have pre-made x-pipe mid pipe assemblies. You can simply cut from after the j-bends past the cats, and the cut right before the frame exhaust hangers, located right at the rear axle differential.

I would preferably go with the mid pipe x-pipe assemblies, as they have better flowing x-pipes, it looks like; not to mention the piping is already pre-measured and set up to fit and be either clamped or welded on, without much issue(s). Do note that they’re usually NON-resonated; so, you might wanna look into maybe going with a mid muffler of some sort. Dual inlet/outlet mufflers of any kind will work; just depends on the sound/tone you’re after, since Magnaflow for example, offers an x-pipe mid muffler (common upgrade).

I would also have some small glasspacks or resonators welded in, if you end up wanting to still quiet down the exhaust system. I have 1-7/8” long tube headers, with off-road connections pipes, a non-resonated Borla Atak x-pipe mid pipe, and a Borla S-Type axleback setup. It’s a bit raspy up top after 4.5-5k+ RPM, but nothing super crazy. Just know that good quality, fiber-glass packed mufflers and resonators, will do the most work, as far as quieting down the overall exhaust..

04-02-2024, 08:28 PM	#1
timmer Drives: 2011 Camaro SS Join Date: Jul 2023 Location: Minnesota Posts: 8	Long tube headers installed! Now what? Well my TSP long tube headers are installed and car is tuned! Only 1 minor issue. I had flowmaster exhaust on it before. I didn’t want it too loud so on the shops advice I put factory exhaust from high flow cats back. I didn’t realize that this exhaust came from a convertible which means L99 not LS3 which means large resonator in front. The shop says this is robbing me of approximately 10-15 whp. What are my options? Cut the resonator out? Get and X or H PIPE? Do a different cat back system? Thank you!

04-02-2024, 08:57 PM	#2
acutron42 Drives: 2013 Camaro 2SS AGM Join Date: Apr 2020 Location: WNY Posts: 790	I think that 10-15 is a high number. __________________ 2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails.

04-03-2024, 06:33 AM	#3
tartagliazl1 Drives: 2013 zl1 vert Join Date: Dec 2018 Location: Rochester, New york Posts: 1,048	Jegs has a nice 409 stainless x pipe for the camaro. Easy to install also. __________________ 22% lower/ 2.5 upper/ 2” headers/ cat delete/ x-pipe/ 2 gallon x tank/ 100-3 pump/ fic 1300/ dsx aux kit/ 103mm throttle body/ RPM 5” intake/ meth kit/ prometh lid injection/FI interchiller/ 160* stat/ ngk-7/ msd wires/ elite catch can/ tsp cam/ Che trunnions/ ported supercharger/ 1/2” lid spacer/ brick mod/BMR toe and trailing arms/ 751hp 757 tq SAE @17.3lb on a loaded dyno.

04-03-2024, 08:49 AM	#4
The_bald_eagle_machine Anthony S Drives: 2011 chevrolet camaro 2ss/rs Join Date: Apr 2021 Location: Chiefland, FL Posts: 979	One of the best sounding cat backs for these cars is the Corsa system... The Borla Atak system is also really nice. These are easy(everything in the box) type systems. But if the car is at an exhaust shop, why can't they just mock up a system for you? __________________ Follow me on instagram @The_bald_eagle_machine https://www.camaro5.com/forums/showthread.php?t=600181 2011 Camaro 2SSRS - Sold No longer a 5th gen owner, but still an enthusiast. Ask me about my Front crash bars!

04-03-2024, 11:41 AM	#5
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,765	^^^ As stated above, if the car is at the shop, if they know what they are doing, they can cut the big resonator out and fab up an x of h pipe for you, and be done with it. If not, then Summit Racing sells a "Tru-Flow" non resonated x pipe, I had one before I went to the Corsa cat back.. https://www.magnaflow.com/products/1...t-x-pipe-10791 __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

04-18-2024, 05:11 AM	#6
TheBrightSide Drives: 2010 Chevy Camaro 2SS coupe (MT) Join Date: Jan 2024 Location: Sacramento, CA - USA Posts: 113	Super easy to have any exhaust shop cut out the huge factory resonator, and weld in a generic x-pipe, with extra piping to offset it to your liking/preference. I don’t know where the best place or what dimensions of x-pipes would be best, although I do know that certain brands like BBK and Borla, have pre-made x-pipe mid pipe assemblies. You can simply cut from after the j-bends past the cats, and the cut right before the frame exhaust hangers, located right at the rear axle differential. I would preferably go with the mid pipe x-pipe assemblies, as they have better flowing x-pipes, it looks like; not to mention the piping is already pre-measured and set up to fit and be either clamped or welded on, without much issue(s). Do note that they’re usually NON-resonated; so, you might wanna look into maybe going with a mid muffler of some sort. Dual inlet/outlet mufflers of any kind will work; just depends on the sound/tone you’re after, since Magnaflow for example, offers an x-pipe mid muffler (common upgrade). I would also have some small glasspacks or resonators welded in, if you end up wanting to still quiet down the exhaust system. I have 1-7/8” long tube headers, with off-road connections pipes, a non-resonated Borla Atak x-pipe mid pipe, and a Borla S-Type axleback setup. It’s a bit raspy up top after 4.5-5k+ RPM, but nothing super crazy. Just know that good quality, fiber-glass packed mufflers and resonators, will do the most work, as far as quieting down the overall exhaust..