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Old 12-02-2018, 07:22 PM   #1
JCurry2885
 
Drives: Black 2018 1SS Camaro M6
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Muffler choice

Hey guys first post here. Just had tsp 1 7/8 long tubes installed on my car. I have a 2018 1ss non npp and it sounds like crap with the long tubes, no cat or resonators routed through the non npp muffler. With that said I'm going to have an exhaust shop make a full 3" exhaust from the headers back with a xpipe. I cant decide on what mufflers to use, or maybe just straights? I'm not worried about it being to loud. Was thinking maybe slp loudmouth 2 mufflers? Let me know your opinions.

Thanks!
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Old 12-02-2018, 09:29 PM   #2
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Old 12-02-2018, 09:40 PM   #3
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https://www.borla.com/products/xr1_m...t__400371.html
Or this one
https://www.borla.com/products/xr1_m...t__400372.html
You can find them cheaper than on the Borla site, make sure you get the multi core not the sportsman type.
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Old 12-03-2018, 08:41 PM   #4
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Isnt the stock npp exhaust a straight pretty much when it's open? Or am I way wrong?
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Old 12-03-2018, 11:43 PM   #5
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Quote:
Originally Posted by JCurry2885 View Post
Isnt the stock npp exhaust a straight pretty much when it's open? Or am I way wrong?
Correct, but you have to be very careful with aftermarket muffler choices due to drone , especially with LT’s and no cats. If there is room you could have the shop weld some bulllet mufflers under the car for a cheaper option. The two mufflers I posted will be close to drone free and sound really good. Search YouTube for CTS-V xr1 multicore, they are very popular in that crowd. I have them, just haven’t had time to install them.
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87' IROC A4 what a car to have at 15 sold
93' Z/28 FBO M6 sold
00' SS H/C/I , 4k yank stall, 100hp TNT N20 sold
10'SS H/C/I M6 sold
12' C6 GS M6 H/C/I , A&A TI Trim ,15" Billet Specialties, 880 RWHP with 109 & meth. 9.70s @ 146 sold.
17' A8 1SS NGM stock for now
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Old 12-05-2018, 08:43 AM   #6
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I'm a flowmaster fan. Check out the super 10 series. People on here seem to like the sound of those. I have the Flowmaster outlaw muffler version, but it only comes with an exhaust kit.
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Old 12-05-2018, 09:44 AM   #7
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Quote:
Originally Posted by JCurry2885 View Post
Hey guys first post here. Just had tsp 1 7/8 long tubes installed on my car. I have a 2018 1ss non npp and it sounds like crap with the long tubes, no cat or resonators routed through the non npp muffler. With that said I'm going to have an exhaust shop make a full 3" exhaust from the headers back with a xpipe. I cant decide on what mufflers to use, or maybe just straights? I'm not worried about it being to loud. Was thinking maybe slp loudmouth 2 mufflers? Let me know your opinions.

Thanks!
Already said, many times that the m6 needs primary cats! I don’t know is bullets would work, I don't know if something like the Borla dual muffler midpipe will work. High flow cats work. Don't think any exhaust work outside of adding cats will work.
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Last edited by oldman; 12-05-2018 at 10:05 AM.
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Old 12-05-2018, 07:34 PM   #8
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Originally Posted by oldman View Post
Already said, many times that the m6 needs primary cats! I don’t know is bullets would work, I don't know if something like the Borla dual muffler midpipe will work. High flow cats work. Don't think any exhaust work outside of adding cats will work.
Bullets in the x-pipe and rear mufflers work pretty good.
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87' IROC A4 what a car to have at 15 sold
93' Z/28 FBO M6 sold
00' SS H/C/I , 4k yank stall, 100hp TNT N20 sold
10'SS H/C/I M6 sold
12' C6 GS M6 H/C/I , A&A TI Trim ,15" Billet Specialties, 880 RWHP with 109 & meth. 9.70s @ 146 sold.
17' A8 1SS NGM stock for now
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Old 12-06-2018, 07:47 AM   #9
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It will be too loud with flowmaster 10's. You need a Delta series Flowmaster to give it a more deep sound without the rasp. Bullets will do the same. Save your hearing too.
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Old 12-06-2018, 08:18 AM   #10
JCurry2885
 
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Quote:
Originally Posted by oldman View Post
Already said, many times that the m6 needs primary cats! I don’t know is bullets would work, I don't know if something like the Borla dual muffler midpipe will work. High flow cats work. Don't think any exhaust work outside of adding cats will work.

Will work as in what? For sound, or are you talking drivability? For sound, I decided to go with (2) SLP loudmouth II mufflers. The car will be going to the muffler shop shortly for all new 3" from headers back, with an H-Pipe and the SLPs. We will see what it sounds like. As far as drivability without cats, I have had no issues so far, drives just like stock for me, even in the low low rpms
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Old 12-06-2018, 10:20 AM   #11
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It is a drivability issue.
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Old 12-06-2018, 02:57 PM   #12
JCurry2885
 
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Quote:
Originally Posted by oldman View Post
It is a drivability issue.
I have no cats now, just a shitty sounding muffler. I don't have any drivability issues that your talking about, or maybe I'm misunderstanding you? I was just asking for recommendations on a replacement muffler so I can get rid of the factory BBQ pit style I have now, and make the car sound better.
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Old 12-10-2018, 08:57 AM   #13
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Should of kept the primary cats or even Kooks green cats work well with the LT4 engines.
As far as mufflers, Borla is all I've ever used & has always sounded great.
On my personal car I'm keeping the BBQ pit muffler with DOD/AFM & NPP, but will be installing Kooks 1-7/8" Headers with high flow cats.
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