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Re: 3" Quiet Exhaust

Posted: Mon Aug 30, 2021 3:15 pm
by Seabass
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.

Re: 3" Quiet Exhaust

Posted: Tue Aug 31, 2021 7:36 am
by bstoner
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.

Re: 3" Quiet Exhaust

Posted: Fri Sep 17, 2021 10:40 am
by bstoner
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.

Re: 3" Quiet Exhaust

Posted: Fri Sep 17, 2021 11:13 am
by s/c'd cav
unless you are making over 1000whp , or drag racing it on a daily basis , you are completely fine

Re: 3" Quiet Exhaust

Posted: Fri Sep 17, 2021 12:13 pm
by bstoner
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.

Re: 3" Quiet Exhaust

Posted: Fri Sep 17, 2021 12:27 pm
by s/c'd cav
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

Re: 3" Quiet Exhaust

Posted: Fri Sep 17, 2021 12:32 pm
by BluesBro
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.

Re: 3" Quiet Exhaust

Posted: Fri Sep 17, 2021 2:16 pm
by s/c'd cav
BluesBro wrote: Fri Sep 17, 2021 12:32 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

Re: 3" Quiet Exhaust

Posted: Thu Oct 28, 2021 9:25 am
by bstoner
It's in!!!!

Setup:
I have 2" primaries ARH Headers coated, their 3" high flow cats, and X-pipe for a Chevy SS. (Note their kit is 3" to the midpipes then necks down to 2.5" where it bends out to clear the diff and turns outward.) Then I am using a Magnaflow 12469 dual in/out muffler. This is the largest muffler/resonator that will fit in tunnel. Next is dual Magnaflow 14419 resonators. I used a set of mandrel bends to clear the diff and turn out to the mufflers. I reused a connection from the ARH kit so I can remove the mufflers. From there another 90 bend to Solo Performance QTM12 mufflers. And then finally a set of eBay Trapezoid Tips. I installed the headers, x-pipe, and first resonator. Shop installed the rest and welded it all up for me. Charged $400.

Review:
It is as quiet as stock. Zero drone so far. Sounds pretty much like stock but the tone is deeper while accelerating. I also notice more engine noise. Of course all this makes sense. Larger diameter pipe makes the sound deeper. Thinner header pipe thickness allows more engine noise through and less dampened. I have DOD turned off so I can't comment on that difference. I am running two resonators and a muffler. I absolutely love it. I am going for sleeper and it hits my target perfect. Now if you want more noise or exhaust note I would probably recommend switching to different mufflers or maybe deleting one of the resonators. The Magnaflow 12469 is an internal crossover, it goes 2 into 1 back into 2, straight through. The Magnaflow 14419 are straight through with packing around the outside. The QTM12 are single in, split into 2 inside, back into 1, straight through as well.

So all in all if you want 3" performance exhaust that is factory quiet this is the way to go. This weekend I will try to get a video or two.

Forgot to mention. In HPTuners I also turned off P0420, P0430, P2097, and P2099 for the high flow cats.

Re: 3" Quiet Exhaust

Posted: Thu Oct 28, 2021 8:51 pm
by kevink
bstoner wrote: Thu Oct 28, 2021 9:25 am It's in!!!!

Setup:
I have 2" primaries ARH Headers coated, their 3" high flow cats, and X-pipe for a Chevy SS. (Note their kit is 3" to the midpipes then necks down to 2.5" where it bends out to clear the diff and turns outward.) Then I am using a Magnaflow 12469 dual in/out muffler. This is the largest muffler/resonator that will fit in tunnel. Next is dual Magnaflow 14419 resonators. I used a set of mandrel bends to clear the diff and turn out to the mufflers. I reused a connection from the ARH kit so I can remove the mufflers. From there another 90 bend to Solo Performance QTM12 mufflers. And then finally a set of eBay Trapezoid Tips. I installed the headers, x-pipe, and first resonator. Shop installed the rest and welded it all up for me. Charged $400.

Review:
It is as quiet as stock. Zero drone so far. Sounds pretty much like stock but the tone is deeper while accelerating. I also notice more engine noise. Of course all this makes sense. Larger diameter pipe makes the sound deeper. Thinner header pipe thickness allows more engine noise through and less dampened. I have DOD turned off so I can't comment on that difference. I am running two resonators and a muffler. I absolutely love it. I am going for sleeper and it hits my target perfect. Now if you want more noise or exhaust note I would probably recommend switching to different mufflers or maybe deleting one of the resonators. The Magnaflow 12469 is an internal crossover, it goes 2 into 1 back into 2, straight through. The Magnaflow 14419 are straight through with packing around the outside. The QTM12 are single in, split into 2 inside, back into 1, straight through as well.

So all in all if you want 3" performance exhaust that is factory quiet this is the way to go. This weekend I will try to get a video or two.

Forgot to mention. In HPTuners I also turned off P0420, P0430, P2097, and P2099 for the high flow cats.
I'm surprised that this is as quiet as stock. When you say that it's as quiet as stock, do you mean you can't hear it running at all at idle? Because that's how quiet stock is. At least my '11 was silent in factory form...