03-19-2019, 09:56 AM | #1 |
Factory Exhaust
What is your guys take on the factory exhaust, in terms of flow (restriction) with long tubes. I get that there is the crimped section. Does anyone have long tubes to factory exhaust and how was the gains? as suppose to full cat back. The only reason why i ask is because i find that this setup is loud but not crazy obnoxious. Would a axle back help at this point or not?
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03-19-2019, 12:41 PM | #2 |
Drives: Fast Join Date: Mar 2015
Location: Michigan
Posts: 3,696
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It's perfectly adequate for flow with a proper LT Headers + long X pipe. If you get something like the ARH Long or Kooks + X Pipe (necked to 2.5" at the back) it will delete the crimped section + eliminate the entire factory X pipe.
Attached two pics that may help for reference. A long header system will end right where the red vertical line is at the back, around the rear axle/diff area. Also attached a picture showing the internals of the NPP. In track mode it's nearly straight through. |
03-19-2019, 11:13 PM | #3 |
Drives: 2017 ZL1 Join Date: Jun 2012
Location: Graniteville,SC
Posts: 645
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Just an fyi. It was tested once and the "crimped" section has no effect on power. The test car made the same power before and after the section was removed.
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03-20-2019, 07:31 PM | #4 | ||
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03-20-2019, 09:11 PM | #5 |
Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018
Location: RGV Texas
Posts: 1,527
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Any other mods besides headers. Since you’ll need a tune with that anyway might as well add an intake.
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03-20-2019, 11:29 PM | #6 |
Totally aware. Currently i have the Roto-Fab cai, LT5 95mm throttle body installed. My e85 flex fuel sensor kit, and elite x2 catch can sitting in my garage will be installed once i get my custom tune done
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03-21-2019, 03:44 AM | #7 |
Drives: 2018 ZL1 Join Date: Mar 2019
Location: Houston, Tx
Posts: 31
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You’ll be good with the Kooks LT, high flo cats and NPP set up you described. You’ll get rid of 90% of the rasp with the high flo’s and still have the volume and tone without it being crazy. I have kooks LT’s, no cats into NPP but added bullet resonators at the “crimp” to kill the rasp/tinny sound. To me it’s just right, the deep sound and loudness are spot on. I ran it without the resonators first and hated it (had a crazy big cam in it at the time) Yours should sound very similar to my current set up, even though I’m (now reasonably) cammed and have more mods.
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03-21-2019, 07:17 AM | #8 | |
Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018
Location: RGV Texas
Posts: 1,527
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03-21-2019, 11:17 AM | #9 | |
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