04-13-2017, 10:03 AM | #1 | ||
Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
Posts: 1,364
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Custom NPP Exhaust! While keeping Valves! Cost friendly Option
Finally did my exhaust
Exhaust : Secondary Cat Delete : Custom Pipe extended Midpipe Midpipe: FlowMaster 81083 Muffler : FlowMaster 8430152 Valve : Stock NPP ( cut and welded ) *EDIT* TIP ( decided to swap the stock tips ) : Flo-Pro Universal 2.5" ID / 4.5" OD / 7" Length Issues : Stock valves rattle. It was doing that with stock NPP. I need to epoxy the pin. Comments : I like it . Don't love it to say. It's really really deep . If you do not have the secondary cat delete there's no drone at all. I have slight drone in tour mode at 1400-1600 rpm .. at 70mph it's fine .. from 60-65 mph there's a slight drone. If you put it in sport mode .. it's really loud! I mean really loud. Vibrates the ear drums lol.. same amount of drone at cruising speeds because the valves close at cruising speeds. Safe to assume it will drone with valves being open at cruising speeds .. Fix : adding a Jpipe to get rid of the drone. Should improve it. I have seen another member make that comment and it fixed the drone according to him. we shall find out after i install the JPipe Cost: MidPipe $300 Mufflers $160 Tips $90 Install $250 Total : $800 So overall I can say not bad to spend $800 total with install for full Catback Exhaust while keeping the NPP function https://www.instagram.com/p/BS4dzlYj9Of/ EDIT 12/30/2017 : ***NEW VIDEO**** Last edited by cmeJATT; 02-22-2019 at 12:08 PM. |
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04-13-2017, 10:04 AM | #2 |
Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
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Not my picture .. but I have the same exact setup
Here's how the Jpipe would be installed ( NOT MY PICTURE ) Last edited by cmeJATT; 08-22-2017 at 12:14 PM. |
04-13-2017, 10:47 AM | #3 |
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so you have 2- 1 into 2 mufflers the simply valved one of the outlets? that doesn't really work like npp if so as both outlets have equal muffling and where npp is basically a cut-out that bypasses the muffling effect when the valve opens
correct me if I am wrong on how yours works |
04-13-2017, 10:56 AM | #4 | |
Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
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The exhaust tone changes by a lot once the valve is open vs closed. But yeah this muffler has 1 inlet and 2 outlets. when one inlet is closed it sounds like what stock NPP sounds with valve open. Once the valve is open its really loud.. so it does the NPP function. Has 2 exhaust notes.. the whole point of NPP on stock system is to go from mild to wild sound. This route allows you to do the same thing. if you go towards end of the video you can hear the difference ..
i will try to make anther video showing the sound difference with valve open vs valve closed. Quote:
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04-13-2017, 11:38 AM | #5 |
Drives: 2016 Camaro 2SS Join Date: Mar 2016
Location: Suffolk Long Island
Posts: 954
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What does the NPP valve bypass? I fail to see it unless these are like the stock muffler and the valve bypasses internal baffling
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2016 Hyper Blue 2SS A8,NPP,Moonroof
Pray ported factory intake manifold Ported TB Rotofab ARH 1 7/8 longtubes hi flow cats AFM deleted E85 11.0@124.9 11.65@118.8 pump gas,stock tune/exhaust New combo: Pray Performance Heads/cam MSD intake manifold and Circle D 3C 554/491 on E85 all work & tuning done by Pray |
04-13-2017, 11:58 AM | #6 |
Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
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04-13-2017, 12:30 PM | #7 |
Drives: 2017 Camaro SS Join Date: Aug 2016
Location: UK
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The muffler is 3inch in and 2 x 2.5inch out, when its closed he effectively has a 2.5 inch exhaust system, when its open its a 3 inch system with quad 2.5inch exits
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04-13-2017, 12:32 PM | #8 |
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although it appears to go through the same baffling, it actually doesnt. there was a cut away done a while back to help explain but its essentially a straight through pipe when its open
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04-13-2017, 01:13 PM | #9 |
Drives: 2019 Camaro SS Join Date: Jan 2017
Location: Chicago
Posts: 138
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Thanks for posting! I think it sounds pretty good! I just received my Flowmaster's from Summit Racing yesterday. Cost was around $150.00 I have an appointment to have them installed tomorrow. Can't wait to hear how it sounds!
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2019 Camaro 1SS. Crush. Mishimoto Catch Can, BMR Strut Tower Brace, Oracle Side Markers, ZL1 Side Skirts, Blade Spoiler W/ZL1 Addons Wicker Bill, Exhaust Cut Outs, BMR Front and Rear Cradle Braces, Cold Air Inductions CAI. ZL1 Rims 285 Fronts and 305's Rear. Speed Inc Tune PCM & TCM.
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04-13-2017, 01:58 PM | #10 |
Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
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have them build a custom J pipe .. i wish i had when the car was on the lift lol .. there is drone when valves are open.
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04-13-2017, 03:44 PM | #11 |
Drives: 2016 Camaro 2SS Join Date: Mar 2016
Location: Suffolk Long Island
Posts: 954
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Yes on the factory NPP if the valves open exhaust flows thru the outside tips bypassing the muffler internal baffles. I was asking the OP what the valves bypassed in this setup he has made. It appears it simply adds an additional port to let exhaust escape the exhaust flows thru the same internal muffler baffles regardless of valve postion.
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2016 Hyper Blue 2SS A8,NPP,Moonroof
Pray ported factory intake manifold Ported TB Rotofab ARH 1 7/8 longtubes hi flow cats AFM deleted E85 11.0@124.9 11.65@118.8 pump gas,stock tune/exhaust New combo: Pray Performance Heads/cam MSD intake manifold and Circle D 3C 554/491 on E85 all work & tuning done by Pray |
04-13-2017, 04:47 PM | #12 | |
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Quote:
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04-16-2017, 06:14 PM | #13 |
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Drives: 17 SuperSport Camaro 6 on the Flo' Join Date: Feb 2016
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He didn't rev it. I wonder why he didn't rev it. Anyone know why he didn't rev it?
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04-16-2017, 06:33 PM | #14 |
Drives: 2016 Camaro 2SS Join Date: Mar 2016
Location: Suffolk Long Island
Posts: 954
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Maybe he should have revved it
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2016 Hyper Blue 2SS A8,NPP,Moonroof
Pray ported factory intake manifold Ported TB Rotofab ARH 1 7/8 longtubes hi flow cats AFM deleted E85 11.0@124.9 11.65@118.8 pump gas,stock tune/exhaust New combo: Pray Performance Heads/cam MSD intake manifold and Circle D 3C 554/491 on E85 all work & tuning done by Pray |
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