I'm installing a new exhaust system on my car soon. I absolutely hate a raspy exhaust, and I'm wondering what it would sound like if I used a couple glasspack mufflers for the entire straight section behind the header and highflow cat, a short glasspack from the center going to the drivers side, another glasspack crossing over to the passenger side after the over axle bend, and then a 5th glasspack exiting out the bumper? Has anyone tried this before? I'm thinking about buying all the glasspacks I need to do it, and then just weld one on at a time until it sounds good, and then just run pipe the rest of the way. I'd just hate to get all those glasspacks welded together and then find out it sounds like crap. All of that's going to be 2.5". I know it's going to be expensive doing it like that, but sound is more important than cost.
To be perfectly clear, I'm saying: header --> high flow cat --> glasspack --> glasspack --> short glasspack --> glasspack --> glasspack --> maybe an exhaust tip
On my truck with a 350ci V8, I have true dual 2.5" exhaust with a 20" glasspack on each side, no cat or real muffler. At idle or light throttle it's fairly quiet, but it roars when I'm on the gas. I know the 4 cyl will never sound like that, but with all glasspack "piping", will it still be at least a little loud WFO, but not be raspy? I have never heard a 4cyl exhaust kit that sounds good to me, if anyone has one that has almost no raspy sound at all with normal driving and minimal raspiness wide open, I'd love to hear it.
Thanks,
Jason
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'04 Cavalier
2.2 Ecotec Supercharged w/ 2.9" pulley
Charge air cooler
Poly bushings - lower control arm and engine/trans
use a real muffler, and you'll not have rasp. dont care how many glasspacks you use, if they're all straight through, its going to rasp.
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Here's a better idea: High-flow cat -> the longest glass-pack you can fit between the cat & the first turn before the rear-axle -> Dynomax Super-turbo -> Resonator-tip(s). If that isn't quiet enough for you, convert to electric!
Go beyond the "bolt-on".
^^^ I just switched to this set up and went to duals. The low rpms is a nice little rumble and WOT is not bumble bee action but is louder but throatier. My guess is with all those staright thrus, you'd probably lose some serious low end torque, but I'm no expert.
Nickelin Dimer wrote:Here's a better idea: High-flow cat -> the longest glass-pack you can fit between the cat & the first turn before the rear-axle -> Dynomax Super-turbo -> Resonator-tip(s). If that isn't quiet enough for you, convert to electric!
I'm not going for quiet, I'm going for not raspy. I love loud, but don't want it to sound like a weed-whacker
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'04 Cavalier
2.2 Ecotec Supercharged w/ 2.9" pulley
Charge air cooler
Poly bushings - lower control arm and engine/trans
Do it.. and then post pics and a video with sound..
I was going to do this set up on my boxer motor swap in my jbody but just said eff it.. and strait piped it..
Rich Grayo Jr. wrote:use a real muffler, and you'll not have rasp. dont care how many glasspacks you use, if they're all straight through, its going to rasp.
Nope... one long ass, perf. core thrush glasspack rosonator will kill all rasp (And I'm talking even with a straight through design muffler too! 2.5" dynomax ultraflow ss).... 28" is the one I have and it barely fits but Im glad it did... I got a smaller cat and moved it towards the downpipe more, have a vetry small section of pipe for the 2nd O2 sensorm then the resonator.. then the start of the over-axle pipe...I should take pics, no-one believes me that I fit a 28" long one under there,
Don't buy from MANTAPART!!
There is no easy ways to get HP, no magic box or gizmo... And if you get more hp, there's no way to make your car still behave and sound like a stock one. More hp usually makes your car louder, more vibrations and harder to drive...but still people hope or think maby there's some magic way to have it all, comfort, stock sound and drive.
Nope... one long ass, perf. core thrush glasspack rosonator will kill all rasp (And I'm talking even with a straight through design muffler too! 2.5" dynomax ultraflow ss).... 28" is the one I have and it barely fits but Im glad it did... I got a smaller cat and moved it towards the downpipe more, have a vetry small section of pipe for the 2nd O2 sensorm then the resonator.. then the start of the over-axle pipe...I should take pics, no-one believes me that I fit a 28" long one under there,
I wouldn't mind some pics, but I'd love to hear it if you can post a sound clip. I can't stand raspy exhaust! My truck has absolutely no rasp with only one 20" glasspack on each pipe. Although I know it has different compression and much different cylinder volume, I don't get why it wouldn't sound like two 2.9L 4 cyls (if they made such a thing) as far as rasp goes. I fired it up and drove around the block with the pipes cut off right behind the cab before I welded the glasspacks on, and damn was it loud... but very little rasp even then. Why is that? What exactly makes one engine very raspy while another has almost none?
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'04 Cavalier
2.2 Ecotec Supercharged w/ 2.9" pulley
Charge air cooler
Poly bushings - lower control arm and engine/trans
i have a cherry bomb glasspack on my '99 Z24 cavalier. sounds great. if you want i can try to get a vid of it.
J-Ri wrote:My truck has absolutely no rasp with only one 20" glasspack on each pipe. Although I know it has different compression and much different cylinder volume, I don't get why it wouldn't sound like two 2.9L 4 cyls (if they made such a thing) as far as rasp goes. I fired it up and drove around the block with the pipes cut off right behind the cab before I welded the glasspacks on, and damn was it loud... but very little rasp even then. Why is that? What exactly makes one engine very raspy while another has almost none?
I'm no expert, and I'm by no means positive about this, but were the pipes cut off after a crossover (H or X pipe)? I believe that helps to cancel out some of the sound waves that would cause rasp. I don't understand how they don't restrict the flow of exhaust but all kinds of V8 engines use them so they must not - in fact I think they help create more power. The firing order (and therefore the exhaust pulses) must be set up to cancel out some negatives and help the flow.
As for the different engines and why the V8 doesn't sound like two 2.9L 4 cylinder engines...well would have something to do with what I said if there is an H or X pipe. But even at that, if you think about it, what RPMs are you seeing with that engine when driving? If you're cruising at, say 2K, then really, each of your hypothetical 4 cylinder engines is really only doing half the work that an actual 4 cylinder engine is doing to produce the same RPMs. Then again, since the two 4 cylinders in your V8 are connected at the crankshaft, they ARE actually still turning the same RPM that the one 4 cylinder is.
I think I might have just confused myself, let alone whether I explained anything that made sense, lol.
