Reducing raspy exhaust

[ginch]

So I have a set of Milltek downpipes and full Milltek exhaust with H pipe. Love the sound however hate the raspy sound it has. Will an X pipe reduce the raspiness of the exhaust and if so who sells just an X pipe connector? Thanks in advance!

Derek

[blkaudi98]

Is the exhaust resonated or non resonated?

[ginch]

I should probably know how however I bought the car with the exhaust on it already. Where are the resonators located, before or after the H pipe connector?

[SacAudi]

i would guess it is non resonated if it is raspy, take a listen to the exhaust compilations...

in general resonators reduce rasp, mufflers reduce loudness, but each setup will be different..

[blkaudi98]

I'm assuming it's non resonated because you said it was raspy. The resonaters should be after the x/h pipe and before the mufflers.
X/h pipe affect the overall sound, American muscle (h-pipe) and exotic (x-pipe).

[ginch]

Well I 99.9% sure its non resonated as I don't recall seeing resonators after the H pipe. So I'm looking to replace the H pipe with an X pipe. Being Milltek, I'm guessing its 2.25" in diameter. Where would I find an X pipe in that diameter?

Thanks a lot for your help gents!

Derek

[M|R]

Installing 2.5" catless dps this weekend, to go with my FI 12" res cat back. Hope it isnt too raspy...

I mention this because resonators reduce rasp...a lot. I will let you know how the rasp is with the 12" I have on there now

[blkaudi98]

Just so you know.... The x-pipe isn't going to help the raspyness very much if at all. Just change the exhaust note to a more exotic sound, and will quiet down the sound a little bit. Your better off getting a exhaust shop to weld some resonaters on. Miltek might even sell you just the resonaters to install.

[ginch]

I just don't want to lose the level of noise as I like how loud it is (probably even a bit louder would be fine) so I'm worried resonators would make it quieter!

[blkaudi98]

And as far as the FI exhaust. You won't get any raspyness with that setup. I have the same thing but with 14" resonaters and there's barely any if none.

[dparm]

Resonators will make it quieter, yes. Smaller resonators should REDUCE the rasp without making the system too quiet, but in the end the biggest resonators possible should remove rasp.

[blkaudi98]

if you want the same loudness you should probably keep the h-pipe, or switch to the x-pipe and get some catless downpipes :)

Resonators mainly affect the raspyness

[ginch]

I just want the exhaust noise to be smoother. So you are saying just resonators will do this with leaving the H pipe in place?

[blkaudi98]

Yes, the resonators will clean up the exhaust tone. If you like the sound of the h-pipe then sure keep it, the resonators will get rid of the raspyness and quiet down the exhaust a slim amount, just because you are adding something slightly restrictive to the exhaust.

[dparm]

Yes, the resonators will clean up the exhaust tone. If you like the sound of the h-pipe then sure keep it, the resonators will get rid of the raspyness and quiet down the exhaust a slim amount, just because you are adding something slightly restrictive to the exhaust.

The restriction is negligible as long as the inner diameter is consistent with the rest of the exhaust tubing.

[blkaudi98]

i stand corrected on that , thanks

[b spot]

X pipe will give a "smoother" sound as it allows the exhaust pulses to draw gas from the other bank more effectively. It reduces back-pressure and takes away some of the oscillation/choppiness of the exhaust note.

[dparm]

X pipe will give a "smoother" sound as it allows the exhaust pulses to draw gas from the other bank more effectively. It reduces back-pressure and takes away some of the oscillation/choppiness of the exhaust note.

Correct. H-pipes (or no joining at all) will let you hear the individual exhaust pulses a bit more, sort of like a muscle car. X-pipes allow the pulses to mix and sounds more refined.

[ginch]

So where might I be able to purchase this X pipe?

[noznab]

Installing 2.5" catless dps this weekend, to go with my FI 12" res cat back. Hope it isnt too raspy...

I mention this because resonators reduce rasp...a lot. I will let you know how the rasp is with the 12" I have on there now

Won't be raspy at all esp with the resonators. What size resonators did you go with? I have 14" on my car and it sounds great.

Just so you know.... The x-pipe isn't going to help the raspyness very much if at all. Just change the exhaust note to a more exotic sound, and will quiet down the sound a little bit. Your better off getting a exhaust shop to weld some resonaters on. Miltek might even sell you just the resonaters to install.

Idk, from what I've witnessed this isn't completely true. All the cars I've heard with an H pipe have sounded very very raspy and tbh imo sound like shit. Having 2.25" exhaust doesn't help either because the exhaust doesn't flow as freely.

So where might I be able to purchase this X pipe?

Your best bet probably is to have someone make you one.

[beemercer]

I'd start with resonators, my experience is better sound with almost no volume/flow decrease. The resonator shouldnt be restrictive really, the ones I've seen are pretty much open chambers

[jlink38]

Correct. H-pipes (or no joining at all) will let you hear the individual exhaust pulses a bit more, sort of like a muscle car. X-pipes allow the pulses to mix and sounds more refined.

I'm running a true dual setup with no resonators, and I only have rasp when the exhaust is cold. I think with short resonators the OP should be good to go!

[beemercer]

^do you have cats still?

[dparm]

A lot of it has to do with how the exhaust was "tuned", if at all. That's why the more expensive exhausts have that more exotic note; research was done on the merge angles, resonator design and size, and mufflers to get that particular note people like.

Rasp is indeed common with cold motors, even with stock exhausts. Some rental cars I've had sound awful until they're fully warmed up.

Honda did something cool on my old S2000 to help. Look at the weird stub near the very back...it was put there to remove rasp. Very careful tuning and analysis was likely done to figure that out. Also, the S2000 had twin-loop mufflers from the factory which gave it very good flow but a smooth and quiet sound.

[jlink38]

So where might I be able to purchase this X pipe?

http://www.amazon.com/s/ref=nb_sb_no...gnaflow+x+pipe

Cheaper:

http://www.amazon.com/s/ref=nb_sb_no...n+x+pipe&ajr=0

[jlink38]

^do you have cats still?

Yes, which is probably why I don't have rasp as well. I guess my point was that he shouldn't change his X/Y/TD pipe setup to get rid of rasp, but should consider resonators first.

[Mr. Corey]

x-pipe = more rasp

[SuperAvant]

x-pipe = more rasp

I have to disagree. H Pipe will have way more rasp than X.

[dparm]

x-pipe = more rasp

X-pipes will smooth out the flow and will allow the exhaust pulses to "line up" properly. It should keep rasp down.

[Mr. Corey]

X-pipes will smooth out the flow and will allow the exhaust pulses to "line up" properly. It should keep rasp down.

X-pipes do smooth out flow but if you take a look at any of the exhaust video clips x pipe is usually more raspy if your comparing to an H pipe..especially if its non res. I said Usually because their a many variables that can change the tone... resonators, non res, x pipe placement, cats, no cats, and if the x pipe actually intersects or just has the bend.
But over the course of the 3 different exhaust setup I've had on my car x pipe was raspy over the H

I have to disagree. H Pipe will have way more rasp than X.

take a look see
H pipe
http://www.youtube.com/watch?v=oSsvW...1DA8EDFFA0AA86
X pipe
http://www.youtube.com/watch?feature...&v=w_oUZfv8xtA

[QIKRNU]

A lot of it has to do with how the exhaust was "tuned", if at all. That's why the more expensive exhausts have that more exotic note; research was done on the merge angles, resonator design and size, and mufflers to get that particular note people like.

Rasp is indeed common with cold motors, even with stock exhausts. Some rental cars I've had sound awful until they're fully warmed up.

Honda did something cool on my old S2000 to help. Look at the weird stub near the very back...it was put there to remove rasp. Very careful tuning and analysis was likely done to figure that out. Also, the S2000 had twin-loop mufflers from the factory which gave it very good flow but a smooth and quiet sound.

Helmholz??

[SuperAvant]

X-pipes do smooth out flow but if you take a look at any of the exhaust video clips x pipe is usually more raspy if your comparing to an H pipe..especially if its non res. I said Usually because their a many variables that can change the tone... resonators, non res, x pipe placement, cats, no cats, and if the x pipe actually intersects or just has the bend.
But over the course of the 3 different exhaust setup I've had on my car x pipe was raspy over the H



take a look see
H pipe
http://www.youtube.com/watch?v=oSsvW...1DA8EDFFA0AA86
X pipe
http://www.youtube.com/watch?feature...&v=w_oUZfv8xtA

Ive had both on my car. H had way more rasp

[dparm]

Helmholz??

Yes, it's called a Helmholtz resonator/chamber.