Dual Exhaust Ideas... 80mm => Scraping

[RBsileighty]

Has anyone run dual exhaust on their cars at all? I am looking into running dual 60mm or 65mm exhaust due to my 80mm setup is scraping quite a bit due to my ride height.

Since the effective area is vital I can't just do two 40mm pipes to equal one 80mm pipe (2*40mm = 2513mm^2 vs 1*80mm = 5026mm^2), so two 60mm or 65mm pipes should work... just thought I'd point that out if anyone asked why so big for two... easily overlooked.

So what I was thinking is run one 80mm dump down to a Y-pipe that split into 2 60 or 65mm pipes all the way back... either exiting with two or converging back to one around the diff since it doesn't hit the ground due to the wheel.

Any experiences or ideas?

Another idea is to run oval... but it might be hard to find some pipe let alone a muffler.

[Bl4cK32]

Yer im running a split system after the cat....well where the cat was

After the cat its a 3.5" pipe that splits into 2 x 2.5" pipes all the way to the rear. Its got 2 x 3" mufflers on the rear of the car.

[Oosh]

Got any pics, sounds interesting...

[R31Nismoid]

lots of people use dual for a number of reasons.

im looking into dual for my HR as part of its new phase to try and quieten then farken thing down to under 120db

[Cubes]

Dual is definitely quieter than the equiv single.

Bl4ck32's is amazingly quiet, still loud but not rude sounding and absolutely zero drone.

Dual = quiet. Another reason APS use it in their xr6 system.

Edited September 20, 2005 by Cubes

[Bl4cK32]

Yes its quieter now with its straight-through system, than with the old single 3" exhaust with the cat.

Oosh- ill try to get pics, but i aint got a camera

Edited September 20, 2005 by Bl4cK32

[ORIGIN]

pics please this sounds interesting

[Ronin 09]

not necessarily quieter... ylwgtr2's twin stainless system he built himself is FARKEN loud

[Cubes]

Its well known amongst the v8 heads a twin 2.5" is quieter than a single 3.5" with the same high quality straight through mufflers.

Edited September 20, 2005 by Cubes

[Bl4cK32]

not necessarily quieter... ylwgtr2's twin stainless system he built himself is FARKEN loud

<{POST_SNAPBACK}>

Mines made from mild steel, which is also known to be quieter than a stainless system.

[RBsileighty]

Very interesting everyone... does anyone have any sound files? My RS*R 3" kit is stupid loud the way it is... sounds good but it'll take the fillings in your teeth out if you have any. Sounds like I'm definitely going dual ...

Here's how mine sounds now... RS*R 3"

Edited September 20, 2005 by RBsileighty

[Ronin 09]

Its well known amongst the v8 heads a twin 2.5" is quieter than a single 3.5" with the same high quality straight through mufflers.

<{POST_SNAPBACK}>

sorry should have qualified that one -

i agree that a twin system with the same size mufflers will be less resonant and quieter, but a 3" aussie built system with decent sized mufflers can still keep the noise down, vs a twin system with smaller mufflers (or only rear 'mufflers' in ylwgtr2's case)

[Cubes]

Ronin09,

Exactly.. A 3" system.

3.5" systems are louder, noticably louder.

A 2 x 2.5" system is on par with a 3.5"-4" with regards to flow.

Thats what should be compared.

Bl4ck32's twin system has small mufflers on the rear, there is no droning and is only slightly louder than my 3" with a larger rear muffler and large center resonator.

I've heard a few 3.5" exhausts and to be honest they sound a little rude loud. I've now seen 2 twins on an rb30det and Tim Possinghams old RB25DET R33. Both looked to be the same exhaust, with regards to rear muffler size.

The Twin was not as rude loud.

That being said both of these twins have been on a single turbo, its quite possible twins on the gtr's twin turbo's react different.

Edited September 21, 2005 by Cubes

[Bl4cK32]

Remember that stainless makes the exhaust drone, and louder as well. My system, if made out of stainless, would be louder than it is now.

[Cubes]

Thats a point I missed.

In all seriousness though, the size of your mufflers, I expected the car to be so damn loud it wasn't funny.

Its quieter than a dude around the corner that has a 2.0"-2.5" exhaust and a cannon on his NA Corolla.

[williamsf1]

well I'm getting a full twin system shortly....

63mm thin walled stainless, straight from each of the TRUST extended dumps.

it should make a little more power and also sound fantastic..

[RBsileighty]

well I'm getting a full twin system shortly....

63mm thin walled stainless, straight from each of the TRUST extended dumps.

it should make a little more power and also sound fantastic..

<{POST_SNAPBACK}>

If anyone has sound files of duals... I'd love to hear them... however, ground clearance is point #1 for me since my Kei Office puts things really close to the ground. Not much could be louder than my 3" RS*R with no resonator and no cat so anything on dB limiting will be an improvement.

Edited September 21, 2005 by RBsileighty

[Oosh]

Yes its quieter now with its straight-through system, than with the old single 3" exhaust with the cat.

Oosh- ill try to get pics, but i aint got a camera

<{POST_SNAPBACK}>

That'd be good but don't sweat it.

[Oosh]

If going duals on a twin-turbo GTR would it be best to go a crossover pipe from the dump/front pipes like most V8's do with pipes from each cyclinder bank?

[williamsf1]

Yes mine will have a nice crossover....

pics to follow after the 29th....