Where can I find 3 inch NPP mufflers? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

sbelyo · 07-13-2023, 06:05 PM

I bought my ZL1 with long tubes to 3 inch cats (gutted), they feed to a 3 inch X pipe that has cutouts in it. The exhaust stays 3 inch until it gets to the rear diff, at that point it looks like they took the stock 2.5 inch pipe that feeds the stock NPP mufflers and stuck it in the 3 inch pipe then welded it shut.

It works but to my ears it doesn't sound good so I was wondering if anyone makes 3 inch NPP mufflers that I can have welded in?

Bigtime53 · 07-14-2023, 11:29 AM

Have you looked at summitt or some of the other places on the net to see if some are available? I doubt they are but I have never looked for any. One of my cars I had headers on it and I cut the cats off and ran straight pipe in their place and it was really loud when you stomped the pedal. I was told at that time any of the high flow cats that were on the market would just burn out so that is why I did it that way. I think you will have to leave what you have on the car as I do not think you will be able to tell any difference if you do find those.

1911 1LE · 07-14-2023, 01:07 PM

Hooker Blackheart makes what you're looking for. I'm pretty happy with mine.

CamaroDreams76 · 07-14-2023, 01:09 PM

Billy Boat

sbelyo · 07-17-2023, 08:57 AM

Quote:

Originally Posted by Bigtime53

Have you looked at summitt or some of the other places on the net to see if some are available? I doubt they are but I have never looked for any. One of my cars I had headers on it and I cut the cats off and ran straight pipe in their place and it was really loud when you stomped the pedal. I was told at that time any of the high flow cats that were on the market would just burn out so that is why I did it that way. I think you will have to leave what you have on the car as I do not think you will be able to tell any difference if you do find those.

It seems billy boat is the only one I can find for now. I'll keep looking

sbelyo · 07-17-2023, 09:07 AM

Quote:

Originally Posted by CamaroDreams76

Billy Boat

it seems that's the only one at the moment

sbelyo · 07-17-2023, 09:08 AM

Quote:

Originally Posted by 1911 1LE

Hooker Blackheart makes what you're looking for. I'm pretty happy with mine.

I marked that one on Summit but it looks like it's recently discontinued

CamaroDreams76 · 07-17-2023, 09:33 AM

I've been down this rabbit hole. There's plenty of companies that make the quad tip exhaust. But B&B is the only one I've found that retains the actual dual mode. I always keep an eye out on the classifieds here.

1911 1LE · 07-17-2023, 03:15 PM

Quote:

Originally Posted by sbelyo

I marked that one on Summit but it looks like it's recently discontinued

I ordered direct from Holley, 15 months ago. I just checked and their site says "not available" also.

camguynj · 07-17-2023, 06:05 PM

Don’t even think you even get replacement 2.5” eom mufflers except maybe used off eBay.
If you really want 3” NPP mufflers I think you’re going to take them apart and weld 3” fittings and inside tubes.

Dega Man · 07-17-2023, 07:40 PM

If it's just the tips you want, Corsa sell the tips that you get and cut you 3 inchers and get the Corsa 4 inch tips welded. If you want 3 inch exhaust all the way back then as someone mentioned above Billy Boat and Hooker Black Heart are the only ones I think.

sbelyo · 07-19-2023, 11:35 AM

I think B&B is the only way. I talked to Holley and they said those NPP mufflers were made for just the ZL1 kits and aren't available. They did say that the one that shows up on the Summit website BH13187 may be custom for them and could still be ordered. I have yet to call them.

I did find a youtube clip of the B&B setup and it sounds great

Triple5even813 · 07-23-2023, 07:21 PM

Best thing I ever did with my car was have a complete custom header-back exhaust fabricated. They thermal coated my headers, and did it in all 3" stainless, x-pipe, v-bands at header collectors and rear diff, and quad 4" tips. No cats, no mufflers, car sounds rowdy as heck and turns lots of heads. Best of all, the price was basically the same as some off the shelf clamp together kit. When you look under the car, it looks really dope and has no leaks.

OP, I know that this is probably a little more extreme than what you're looking for, but a good fabrication shop may be able to come up with a much nicer solution for your car than what you can get off the shelf from some website, and probably for a better price.

sbelyo · 07-28-2023, 01:40 PM

Yeah, That sounds excellent. I'd love to do v bands from the header back. I'm trying to get to Jeremy Formato's shop this summer for a tune and E85. I'm going to ask him who he recommends for a custom shop. There is one here in Ocala FL, but they're real busy. I'd like to find a shop that does exhaust primarily

07-13-2023, 06:05 PM	#1
sbelyo Drives: n/a Join Date: Jan 2015 Location: United States Posts: 67	Where can I find 3 inch NPP mufflers? I bought my ZL1 with long tubes to 3 inch cats (gutted), they feed to a 3 inch X pipe that has cutouts in it. The exhaust stays 3 inch until it gets to the rear diff, at that point it looks like they took the stock 2.5 inch pipe that feeds the stock NPP mufflers and stuck it in the 3 inch pipe then welded it shut. It works but to my ears it doesn't sound good so I was wondering if anyone makes 3 inch NPP mufflers that I can have welded in?

07-14-2023, 01:07 PM	#3
1911 1LE Drives: 2015 SW 2SS 1LE Join Date: Jan 2018 Location: 78155 Posts: 308	Hooker Blackheart makes what you're looking for. I'm pretty happy with mine. __________________ Maggie 2650 @ 18psi/ 75mm 10 rib/ Dual alky nozzles/ Roto-fab/ ARH 2" Lt's/ GT-12 cam/ ZL1 3.23 Conv./MGW/RPS triple carbon clutch/RSG tranny upgrage/Pedders Ex. XA w/ remote cans and a lot of other crap 897/8??@tires

07-14-2023, 01:09 PM	#4
CamaroDreams76 Tri-County Camaro SWFL Drives: 2013 IOM 2SS/RS/1LE Join Date: Apr 2013 Location: South West FL Posts: 3,079 View My Garage	Billy Boat __________________ Just bolt ons........ https://www.camaro5.com/forums/showthread.php?t=343023

07-17-2023, 09:33 AM	#8
CamaroDreams76 Tri-County Camaro SWFL Drives: 2013 IOM 2SS/RS/1LE Join Date: Apr 2013 Location: South West FL Posts: 3,079 View My Garage	I've been down this rabbit hole. There's plenty of companies that make the quad tip exhaust. But B&B is the only one I've found that retains the actual dual mode. I always keep an eye out on the classifieds here. __________________ Just bolt ons........ https://www.camaro5.com/forums/showthread.php?t=343023

07-23-2023, 07:21 PM	#13
Triple5even813 Learner of things Drives: 2013 ZL1 M6 coupe, black Join Date: Dec 2017 Location: Tampa, Florida Posts: 98 View My Garage	Best thing I ever did with my car was have a complete custom header-back exhaust fabricated. They thermal coated my headers, and did it in all 3" stainless, x-pipe, v-bands at header collectors and rear diff, and quad 4" tips. No cats, no mufflers, car sounds rowdy as heck and turns lots of heads. Best of all, the price was basically the same as some off the shelf clamp together kit. When you look under the car, it looks really dope and has no leaks. OP, I know that this is probably a little more extreme than what you're looking for, but a good fabrication shop may be able to come up with a much nicer solution for your car than what you can get off the shelf from some website, and probably for a better price. __________________ 2013 M6. Cammed, straight piped, 17# boost, E85. Tuned by CHenry Motorsports. 825rwhp @ 6450, 812 rwtq @ 3500. Stock unported blower, stock heads, stock bottom end, stock throttle body. Boost only, no meth, no nitrous

07-14-2023, 11:29 AM	#2
Bigtime53 Drives: 2013 ZL1 Join Date: Mar 2013 Location: Oklahoma Posts: 2,298	Have you looked at summitt or some of the other places on the net to see if some are available? I doubt they are but I have never looked for any. One of my cars I had headers on it and I cut the cats off and ran straight pipe in their place and it was really loud when you stomped the pedal. I was told at that time any of the high flow cats that were on the market would just burn out so that is why I did it that way. I think you will have to leave what you have on the car as I do not think you will be able to tell any difference if you do find those.

07-17-2023, 06:05 PM	#10
camguynj Drives: '13 SS/RS LS3 BRM Cammed NPP Join Date: Jan 2013 Location: NJ Posts: 3,812 View My Garage	Don’t even think you even get replacement 2.5” eom mufflers except maybe used off eBay. If you really want 3” NPP mufflers I think you’re going to take them apart and weld 3” fittings and inside tubes.

07-17-2023, 07:40 PM	#11
Dega Man Drives: ZL1 Join Date: Oct 2012 Location: Talladega Posts: 631	If it's just the tips you want, Corsa sell the tips that you get and cut you 3 inchers and get the Corsa 4 inch tips welded. If you want 3 inch exhaust all the way back then as someone mentioned above Billy Boat and Hooker Black Heart are the only ones I think.

07-19-2023, 11:35 AM	#12
sbelyo Drives: n/a Join Date: Jan 2015 Location: United States Posts: 67	I think B&B is the only way. I talked to Holley and they said those NPP mufflers were made for just the ZL1 kits and aren't available. They did say that the one that shows up on the Summit website BH13187 may be custom for them and could still be ordered. I have yet to call them. I did find a youtube clip of the B&B setup and it sounds great

07-28-2023, 01:40 PM	#14
sbelyo Drives: n/a Join Date: Jan 2015 Location: United States Posts: 67	Yeah, That sounds excellent. I'd love to do v bands from the header back. I'm trying to get to Jeremy Formato's shop this summer for a tune and E85. I'm going to ask him who he recommends for a custom shop. There is one here in Ocala FL, but they're real busy. I'd like to find a shop that does exhaust primarily