Well I found out that I can have true duals on my car and will be doing going foward with it end of winter/beginning of spring. I once saw somebody fab up a true dual exhaust with a single magnaflow muffler that was dual 2.5 in and dual 2.5 out. My question is does anybody think it would be better to go with the single muffler or just suck up the extra 60 bucks or so and go ahead with dual mufflers?

BTW if I go dual muffler I will most likely go Hooker Areochamber. (Kinda wished I had Hooker Areochamber on my car now...Magnaflow didnt hide my lopiness of my cam as much as I thought it would)

 

Not sure what you mean by that.

Any dual system will be a compromise of ground clearance, although you can sort of run 2-1/4" side-by-side down the factory routing. Things get really tight going over the axle.

Cross flow mufflers generally don't flow well. A single 3" in/3" out will flow better than a dual 2-1/2" in/out crossflow.

 

i dont plan on running them in stock location nor do i plan on running them over the axle

 

yeaaaaaa boyyyyyyyyy! u want BOOM TUBESSSS! lol
u want turndowns, if ur going turndowns u want 2 seperate single mufflers.
one single dual muffler will compromise more ground clearance since the mufflers are alot larger than the single mufflers. best setup would be run duals in stock location as stated about with a single dual in dual out muffler int he stock location.
turndowns are gona be super loud since the exhaust system is no longer than 6 feet. im running 3inch true dual, all mandrel bends, with headman longtubes, 3" xpipe and 2 3" force mufflers with turndowns, the sound is increadable, so much better than a single aftermarket setup, but ground clearance is def compromised. i couldnt throw that crap of a system that GM designed back in there even as an aftermarket peice.
i knotched/boxed the stock subframes since i ran it straight back and since i had installed thru floor subframes earlier, and ran them straight back through the Xpipe and right into the mufflers. i had true duals before this setup but the xpipe def helped with the noise/tone.

as far as mufflers are concerned i have heard blowmaster, afterburners, force, edlebrock, mac, moroso spirals, glass packs
out of all of them the best sounding with no resonance are afterburners, force, and edelbrocks. afterburners arent as nice looking as the edelbrocks/force and thats the only reason why i went with the forces... originally i had the afterburners.
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by the way.... how lopy is your cam? im building a HSR 383 with 195cc patriot heads, and a compcams XFI280 bumpstick with 230/236 .567/.571 lift with 113 lobe, i just want to get a guesstimate of how lopy mine will be

 

customblackbird...check out my exhaust sound with my magnaflow and you can hear the lopiness....its not too much and not too little

 

how the heck would you use a single 2 in 2 out muffler w/o going over the axle? somehow mount it under the torque arm and driveshaft? it would drag on the ground unless the car's lifted or something..you would have like no ground clearance what so ever, if your gonna dump before the axle your gonna want some really small mufflers, something with a straight through shot.. ground clearance will be really compromised and you're gonna wanna avoid speed bumps at all costs but it'll be really loud if that's what your going for.. I had em for a time on my 89 but daily driving it became annoying with the echoing noise, the constant scraping, the fumes in the windows, and getting pulled over since it's not legal.. but it was loud.. I'll give it that..

 

i didnt say single 2 in 2 out....i said dual 2.5 (2 and a half) in and dual 2.5 out...

now i remember the guy that used the dual 2.5 in dual 2.5 out did go over the axle so if i do duals i will use two single 2.5 in/out mufflers

 

yea i heard it but it didnt seem that like it had much lope... darn i wanted sum lope lol.

the way i did mine with the 2 single boxed mufflers not the spirals/straight throughs was i knotched the stock subframes, and the lowest part is the mufflers for now but the rest is the same height as my deep trans pan when i put the motor in and pull the exhaust off im gona cut into the floor alil more at the muffler and tuck them up real nice i would go boxed muffler or traditional over the straight through/spirals bc they are crazy annoying loud, since ive had mine i have yet to be pulled over for noise... just speeding but its loud enough for your ***** to vibrate 3 feet from the car and set off about any car alarm as u drive by... oh yes and parking garages are tons of fun

i could see a very clean set up running 2 2.5" pipes in the stock location all the way over the rear axle and into a dual 2.5" in/out muffler with 2 exits on the driver side. that would be nice and u would have all the ground clearance /noise that u want.

 

yeah but going over the axle would be expensive as hell, plus muffler shop wouldnt wanna try to do something like that....if they did....lots more $

 

looking at dual exhaust pics, i like the way mwnova had his duals set up before he went single 3.5....

 

but the problem is he didnt have to put cats on his....so mine would have to be moved back about a foot or so

 

why do you need cats? is there a visual inspection for your area cause i know they wont crawl under the car and do a tailpipe test of ur mufflers are dumped under the car.

 

Turn downs are the easiest way to go, not the best looking, but still the easiest......they will make the inside of the cab vibrate too

 

his setup wasnt that nice... his car is sitting really really high inorder to get that much clearance with that design. he must have 4" or more of fender gap, that also doesnt show u the muffler side ground height, thats usually the lowest point bc u cant tuck it up anywhere, tho that is the easiest way, drop ur car (or if its sittin alil low) and those pipes will be literally on the ground.

i had a setup like that before but it was cleaner with a custom crush bent pipes over the tranny crossmember and i only had 2-2.5" of ground clearance, with the stock sagging WS6 springs with 120,000 on them.

 

how did you fit exhaust on top of the trans member?

 

yeah there is a visual inspection for at least the shell...the cats that are on my car right now (factory dual cats) are only 2.25 in and out so cant use those.

 

when i said over i meant as in over the trans member on the ground side. theres no real way to get them literaly up there. it was 3" pipe that was crush bent so it was prob 2.5" at the biggest bend which was not that big a bend but it worked for me bc the tranny cross member actually tucked into the bent part of the pipe.... giving me another 1/4" or so of more ground cleanance.

just get cheap universal 2.5" cats.... i get them for 50$ and they are high flows... the highflows give u more tq but only use up 5hp if that

 

check out my cardomain site ive got pics of my duals 2.5 inch all they way to the bumper. www.cardomain.com/ride/2197664

 

That's pretty slick puttin' two mufflers at the back, like a Corvette...

I like it!

When you switched from single to duals, what headers were you using? The dyno sheets I've seen don't show a hp difference between single 3 and dual 2 1/2 if you use a good y transition, like the flowmaster piece. What y-pipe did you run with your single setup?

I'm curious because you claim a pretty hefty increase in hp after your switch...

 

i would say to try boom tube mufflers. They have the clearance and also designed as a muffler. I have clearance problems with single 3"(it might be 2.5"), i can't imagine getting even less clearance, so my only choice is boom tubes.
EDIT: actually looking at the picture of the exhaust on my car, if i went with duals dumped before the axles, i wouldn't loose any more clearance than what i have now.

 

those duals on the cardomain are not bad... depending on the bends tho bc of how they are cut and welded and not true mandrel/smooth transitions will hurt slightly. i would like to see it on the ground tho. the ground clearance cant be that great bc it looks like its the same height as the deep trans pan, which is the same as mine and since mine is lowered with sportlines its still low.