01-03-2021, 09:28 AM | #29 |
Drives: 2021 Red Hot ZL1 Join Date: Sep 2020
Location: Gapplebees
Posts: 3,090
|
The touring exhaust is straight through too, just uses their 180 degree mufflers to control the sound, I strongly recommend you use the touring exhaust if you have headers and high flow cats. The track exhaust would be unbearably loud.
|
01-03-2021, 12:18 PM | #30 |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
|
|
01-03-2021, 01:09 PM | #31 |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
|
OK, you guys convinced me. What about this Touring cat back, but I wonder if it comes with less of a muffler?
__________________
'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. Last edited by JSH; 02-09-2021 at 12:56 PM. |
01-03-2021, 03:18 PM | #32 |
Drives: 2021 Red Hot ZL1 Join Date: Sep 2020
Location: Gapplebees
Posts: 3,090
|
Catback is the same mufflers as the axle back, with the catback you're paying for 3" mandrel bent pipe from the cats back. You can also go with the resonated touring exhaust which adds resonators right after the cats to help take some edge off. I strongly recommend the resonated touring catback if you decide to go with a catback. Otherwise go with the touring axle back.
|
01-03-2021, 04:03 PM | #33 | |
Drives: Wild Cherry LT1 Join Date: Dec 2016
Location: Massachusetts
Posts: 1,925
|
Quote:
As has been noted, to each their own... |
|
01-03-2021, 04:17 PM | #34 | |
Drives: R.I.P. 2021 ZL1 & 2019 Rd Garn 2SS Join Date: Dec 2019
Location: Chattanooga, TN
Posts: 268
|
Quote:
|
|
01-03-2021, 05:19 PM | #35 | |
Drives: 2021 Red Hot ZL1 Join Date: Sep 2020
Location: Gapplebees
Posts: 3,090
|
Quote:
|
|
01-04-2021, 08:39 AM | #36 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
|
I have had the Flowmaster NPP for a couple seasons now. I like it other then I do get some drone with the valves open but I do have cat deletes. The valves being closed is significantly quieter then open. I do think the exhaust would be about perfect with cats. So for that reason I have the Corsa NPP on order. CSP had a good sale on it over the Holidays so I decided to try it. Probably just wasting money at this point but I had a few Holiday bucks to spend. Take note you don't gain power from any exhaust mod post cats, so you are essentially spending a grand or two for looks and sound. I definitely wouldn't want to give up the NPP function if you have LT headers and/or cat delete's. These cars get stupid loud and having the ability to quiet the exhaust note is Nice when you just want to cruise around and not make a bunch of noise. Really loud exhaust gets old after a while imo.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
01-04-2021, 10:35 AM | #37 | |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
|
When you say cat deletes, do you mean hi-flow cats or no cats?
Regarding hp, it's my understanding that the stock cat back has a crimp in each pipe at the axle. If this crimp is significant enough to cause any back pressure, then it theoretically reduces hp since this engine should perform best with a scavenging effect or negative pressure at the exhaust valve/port. If said crimp does not cause ANY back pressure then an axle back system would be sufficient for me. Quote:
__________________
'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
|
01-04-2021, 10:53 AM | #38 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
|
Quote:
Far as the crimp section...It's been proven that the NPP cat back is not restrictive until you get north of 800whp. CSP did a dyno comparison when he had his H/C ZL1 and gained like 3-4whp. The exhaust mods that gain power are deleting the primary cats(biggest bottle neck), then headers. Headers with high flow cat's are marginally better then factory headers with cat deletes. Catless 2" headers are worth about 20whp over stock headers with cat delete's on a 7-750whp car. I am sure the gains become greater the closer you get to that 1k whp mark.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
|
01-04-2021, 11:10 AM | #39 | |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
|
So the crimp does NOT reduce hp which makes the case for me for an axle back system, with the caveat that I'll add another 50hp soon, which will get me near 800 wheel
Quote:
__________________
'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
|
01-04-2021, 11:17 AM | #40 |
Drives: 2021 Red Hot ZL1 Join Date: Sep 2020
Location: Gapplebees
Posts: 3,090
|
|
01-04-2021, 11:39 AM | #41 |
|
I have the AWE axel back on my car. It was a non npp single dual tip not the quad tip setup. little rowdy on cold starts but other than that it has zero drone and sounds great. Quiet at highway speeds but mash that happy pedal and she comes alive
|
01-04-2021, 06:20 PM | #42 |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
|
I don't see an axle-back system for my car at their site (?)
__________________
'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
|
|
Post Reply
|
|
|