3in exhaust system - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

GodWentPunk · 02-20-2019, 09:50 AM

So I recently purchased a 3in exhaust system made by ARH however, the mufflers I have use a 2.5 inlet. I've done some looking around and I don't see a lot of 3in mufflers so is it typical to get a reducer in this case? I know using a reducer is not ideal but I can't imagine that I'll loose that much performance by going this route.

Do most of you guys go the reducer option?

joe...

SynergyGreenSS · 02-20-2019, 09:54 AM

That’s what I did for my npp’s

camguynj · 02-20-2019, 10:57 AM

Quote:

Originally Posted by GodWentPunk

So I recently purchased a 3in exhaust system made by ARH however, the mufflers I have use a 2.5 inlet. I've done some looking around and I don't see a lot of 3in mufflers so is it typical to get a reducer in this case? I know using a reducer is not ideal but I can't imagine that I'll loose that much performance by going this route.

Do most of you guys go the reducer option?

joe...

Do you have the NPP exhaust?

GodWentPunk · 02-20-2019, 11:23 AM

Quote:

Originally Posted by camguynj

Do you have the NPP exhaust?

I do not have NPP...

Batmanntexas · 02-20-2019, 12:25 PM

If you are keeping the car naturally aspirated, having it reduced down to 2-1/2" at the mufflers isn't a huge deal.

Are you doing the work yourself or having a shop do it? In either case, if you wanted to keep it 3" all the way, you could cut out the 2-1/2" inlet pipe and weld in its place a 3" exhaust coupler to maintain a slip-fit joint, or just weld your 3" pipe directly to the muffler.

-Scott

camguynj · 02-20-2019, 12:51 PM

Quote:

Originally Posted by GodWentPunk

So I recently purchased a 3in exhaust system made by ARH however, the mufflers I have use a 2.5 inlet. I've done some looking around and I don't see a lot of 3in mufflers so is it typical to get a reducer in this case? I know using a reducer is not ideal but I can't imagine that I'll loose that much performance by going this route.

Do most of you guys go the reducer option?

joe...

If you don’t want to reduce down to 2.5” mufflers check out Flowermaster,Borla or Steelworks 3” mufflers for non-NPP cars.

sixty9fordkiller · 02-20-2019, 04:10 PM

Quote:

Originally Posted by GodWentPunk

I've done some looking around and I don't see a lot of 3in mufflers

this is not accurate. there are plenty of 3" mufflers

but yes, reducers are an option if you prefer to use 2.5" mufflers

camguynj · 02-20-2019, 05:17 PM

Here you go. Just order the mufflers.
https://www.borla.com/products/camar...t__140348.html

GodWentPunk · 02-21-2019, 01:55 PM

Quote:

Originally Posted by camguynj

Here you go. Just order the mufflers.
https://www.borla.com/products/camar...t__140348.html

I have a convertible so this one will not work. Ideally, I was looking for axle back systems and not just mufflers and for my vert, there aren't a lot of options out there. My gut was telling me that my installation will be a lot less if the guys only need to hookup a axle back versus having to put together pipes and weld things on (such as tips). But, it might be cheaper to have them weld things together versus a axle back system-- I'll have to ask.

joe...

sixty9fordkiller · 02-21-2019, 02:06 PM

Quote:

Originally Posted by GodWentPunk

I have a convertible so this one will not work. Ideally, I was looking for axle back systems and not just mufflers and for my vert, there aren't a lot of options out there. My gut was telling me that my installation will be a lot less if the guys only need to hookup a axle back versus having to put together pipes and weld things on (such as tips). But, it might be cheaper to have them weld things together versus a axle back system-- I'll have to ask.

joe...

it will depend on the price mufflers you use.

camguynj · 02-21-2019, 03:22 PM

Quote:

Originally Posted by GodWentPunk

I have a convertible so this one will not work. Ideally, I was looking for axle back systems and not just mufflers and for my vert, there aren't a lot of options out there. My gut was telling me that my installation will be a lot less if the guys only need to hookup a axle back versus having to put together pipes and weld things on (such as tips). But, it might be cheaper to have them weld things together versus a axle back system-- I'll have to ask.

joe...

Hey Joe, Check out StainlessWorks 3" cat back with 3"mufflers (for Verts too). You'd just have to cut the mufflers at the axle and weld them to your 3" ARH pipes then your 3" all the way.

https://www.phastekperformance.com/S...aro-ca11cb.htm

xc_SS/RS · 02-21-2019, 03:45 PM

Dude don't do it. Reducing to a 2.5" muffler inlet will kill 50% of power and torque and make your car sound like a Corolla. /s

In all honesty you will lose no power or torque having a 2.5" inlet all the way at the back of your exhaust system. Have a shop weld it up and youll be fine

GodWentPunk · 02-24-2019, 06:04 AM

Quote:

Originally Posted by xc_SS/RS

Dude don't do it. Reducing to a 2.5" muffler inlet will kill 50% of power and torque and make your car sound like a Corolla. /s

In all honesty you will lose no power or torque having a 2.5" inlet all the way at the back of your exhaust system. Have a shop weld it up and youll be fine

Thanks for stopping my heart for a second :lol

joe...

02-20-2019, 09:50 AM	#1
GodWentPunk Drives: 2015 2SS White Convertible CE/INDY Join Date: Mar 2016 Location: Lockport, IL Posts: 780 View My Garage	3in exhaust system So I recently purchased a 3in exhaust system made by ARH however, the mufflers I have use a 2.5 inlet. I've done some looking around and I don't see a lot of 3in mufflers so is it typical to get a reducer in this case? I know using a reducer is not ideal but I can't imagine that I'll loose that much performance by going this route. Do most of you guys go the reducer option? joe... __________________ ARH LTH/HFC/Legato muffler, RDP Custom Tune, K&N Blackhawk CAI, Bigworm Blackout kit, ZL1 Rims, Phantom Grills, VMAX PTB Last edited by GodWentPunk; 02-20-2019 at 10:13 AM.

02-20-2019, 09:54 AM	#2
SynergyGreenSS Drives: 2011 2SS Join Date: Mar 2015 Location: Arlington, Texas Posts: 1,333	That’s what I did for my npp’s __________________ 2011 SS L99 LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears

02-20-2019, 12:25 PM	#5
Batmanntexas Drives: 2012 Camaro SS (2SS) Join Date: Aug 2012 Location: Stafford, VA Posts: 1,372 View My Garage	If you are keeping the car naturally aspirated, having it reduced down to 2-1/2" at the mufflers isn't a huge deal. Are you doing the work yourself or having a shop do it? In either case, if you wanted to keep it 3" all the way, you could cut out the 2-1/2" inlet pipe and weld in its place a 3" exhaust coupler to maintain a slip-fit joint, or just weld your 3" pipe directly to the muffler. -Scott __________________ 745RWHP/634RWTQ on 93 @ 10psi 806/676 on E85 @ 10psi COTW 9/8/14

02-21-2019, 03:45 PM	#12
xc_SS/RS Drives: 2010 Camaro SS/RS Join Date: Mar 2014 Location: somewhere in MD Posts: 4,883	Dude don't do it. Reducing to a 2.5" muffler inlet will kill 50% of power and torque and make your car sound like a Corolla. /s In all honesty you will lose no power or torque having a 2.5" inlet all the way at the back of your exhaust system. Have a shop weld it up and youll be fine __________________ 2010 2SS/RS Z/28 intake, NW, FAST 102, speed engineering LT's, some exhaust, ATI -10% pulley, GM flex fuel injectors, DSX flex fuel sensor, MGW shifter, HP Tuners, some suspension work, stickers and a little weight loss. 12.63 @113.53

02-20-2019, 05:17 PM	#8
camguynj Drives: '13 SS/RS LS3 BRM Cammed NPP Join Date: Jan 2013 Location: NJ Posts: 3,812 View My Garage	Here you go. Just order the mufflers. https://www.borla.com/products/camar...t__140348.html