3" Quiet Exhaust

Discussion on fuel delivery & intake/exhaust tech & mods.
Seabass
Posts: 23
Joined: Mon Jan 13, 2020 5:56 pm

Re: 3" Quiet Exhaust

Post by Seabass » Mon Aug 30, 2021 8:15 pm

Have any of you considered merging into a single tube under the car instead of a X or H? this should average out the exhaust pulses and make more of a purr over a lope or chop.
14 Caprice
Looking for a white or silver 11-12
Looking for:
complete stock exhaust
Ls3 intake

bstoner
Posts: 51
Joined: Wed May 05, 2021 7:12 pm

Re: 3" Quiet Exhaust

Post by bstoner » Tue Aug 31, 2021 12:36 pm

Right now I have ARH headers on order with cats and coated and they are probably 4-8 weeks out. I plan on putting in a Magnaflow dual pipe resonator in place of the X pipe then run dual Magnaflow resonators out to Solo quiet mufflers. The Magnaflow dual pipe resonator 12469 is pretty much what you describe. The dual pipes neck down to a single pipe and open back up into duals. It may be a small restriction but the noise reduction is a priority for me.
2014 PPV, work in progress, 3.45, eventually LSA....

bstoner
Posts: 51
Joined: Wed May 05, 2021 7:12 pm

Re: 3" Quiet Exhaust

Post by bstoner » Fri Sep 17, 2021 3:40 pm

My ARH headers. cats, and pipes came in. Unbeknownst to me a 3" kit actually means 3" to the straight mid-pipes then it necks down to 2.5" where the two pipes angle outward to clear the rear diff. I am undecided if I should run the 2.5" pipes (along with 2.5" mufflers) or replace it with 3". I may also contact ARH to see if they can swap the 2.5" pipes for 3" pipes but I doubt it.
2014 PPV, work in progress, 3.45, eventually LSA....

s/c'd cav
Posts: 1102
Joined: Mon May 30, 2016 8:12 am
Location: PHOENIX AZ

Re: 3" Quiet Exhaust

Post by s/c'd cav » Fri Sep 17, 2021 4:13 pm

unless you are making over 1000whp , or drag racing it on a daily basis , you are completely fine

bstoner
Posts: 51
Joined: Wed May 05, 2021 7:12 pm

Re: 3" Quiet Exhaust

Post by bstoner » Fri Sep 17, 2021 5:13 pm

My target is 800 hp. LS3 block (or more depending on funds), LSA maybe 2300, E85 and obviously all supporting mods to get there. Probably about 5 years out based on budget. I have read mixed things over on SSForums and Camaro5. Some say go 3 inch if you are going F/I. Others say 2.5 becomes limiting around 500-600 hp. Yet others say 2.5" is fine. If I stayed with the ARH I would have 2" headers, 3" collectors, 3" cats/midpipes/resonators, and 2.5 mufflers and tips.
2014 PPV, work in progress, 3.45, eventually LSA....

s/c'd cav
Posts: 1102
Joined: Mon May 30, 2016 8:12 am
Location: PHOENIX AZ

Re: 3" Quiet Exhaust

Post by s/c'd cav » Fri Sep 17, 2021 5:27 pm

ive got a few friends running 3" into 2 1/2" and making over well 800whp , 1 is a G8 GXP manual runs mid-low 10's using the kooks knock off 1 7/8 headers , another is a SS and was running mid 9's using the arh with 2" headers

my caprice will be going together with the SS arh 2" system

BluesBro
Posts: 46
Joined: Tue Aug 03, 2021 6:26 am

Re: 3" Quiet Exhaust

Post by BluesBro » Fri Sep 17, 2021 5:32 pm

I'd try to get 3" all the way out if you are planning on F/I, exhaust velocity is a huge factor. Going from 2.5" to 3" would be less of a problem than necking down 3" to 2.5". I don't like doing things twice, and have a similar timeline if not longer for a F/I setup on mine, as such straight to a 3" exhaust. It is overkill right now but at least I wont be redoing the cat back.

I don't doubt 2.5 setups can handle the flow, more of a mental thing for me I guess.
2014 Caprice PPV 6.0L - TSP Stage 1 Cam, Solo 3in Mach Cat Back, HP Tuned
2002 Avalanche 5.3L - MBRP Exhaust, RC 6in Lift

s/c'd cav
Posts: 1102
Joined: Mon May 30, 2016 8:12 am
Location: PHOENIX AZ

Re: 3" Quiet Exhaust

Post by s/c'd cav » Fri Sep 17, 2021 7:16 pm

BluesBro wrote:
Fri Sep 17, 2021 5:32 pm
I'd try to get 3" all the way out if you are planning on F/I, exhaust velocity is a huge factor. Going from 2.5" to 3" would be less of a problem than necking down 3" to 2.5". I don't like doing things twice, and have a similar timeline if not longer for a F/I setup on mine, as such straight to a 3" exhaust. It is overkill right now but at least I wont be redoing the cat back.

I don't doubt 2.5 setups can handle the flow, more of a mental thing for me I guess.
LMFAO !!!!!!!!

the farther away from the exhaust port the velocity of the exhaust SLOWS down , so dropping from 3" into 2 1/2" will keep the velocity up , it also doesnt help with our cars being so long

as i mentioned , if he is doing a full tilt drag car then , yes all 3" is the way to go , for a street car that sees random track time , then the drop to 2 1/2" is fine

Post Reply