Im Making Up A Twin 3inch Zorst...

[femno]

Hey all,

Over the holidays im going to make up a twin 3inch from the dumps back for me GTR, and after searching i have a couple of specific questions.

Now im wondering what mufflers people have used at the rear as twins and where to get them. I want to use stainless ones. Brands and body size.

Id also like to know if and where I may be able to get the smallest cats possible instead of using the big conventional bolt up type cat that everyone uses on a single. Weld-in ones would be ideal, no need for flanges.

Balance pipes. Are they a must? I notice none of the jap units have them but is it because they are supposedly tuned-length? I understand it would be difficult to get the pipes the exact same length...If not will there be any power loss and is it possible that the exhaust will be more droney than usual if i dont have them?

Im in VIC so if anyone can recommend any shops that would be great too.

Yes i know theyre going to be loud so I dont need any advice in that

Thanks in advance.

Mat.

[ali-turko]

hey man i wanna do this aswell except i was thinking twin 2.5", let me no if your keen to gimme a hand to build a second one

[zebra]

Go a 3" X pipe (exhaust shop will be able to get one for you) instead of just a straight balance pipe.

I think Drift (brand) have small diamiter cats to suit S13s in 3" (autobarn sell them, not cheap tho) and due to space restraints in the rear end you could a twin 3" in/out muffler (try X-force or Lukey for these)

hope this helps

[Roy]

I think twin 3" is way too much pipe and be droney as hell, not to mention very hard to package up tight in the underside of the car.

[R31Nismoid]

Yeah twin 3" is far beyond overkill unless your after 70000rwkw

Twin 2.5" would be more than ample, or twin 2.5" that feeds into 3.5" at the most for your setup

Much bigger would just create drone/noise etc but offer no gains

[femno]

Yeah twin 3" is far beyond overkill unless your after 70000rwkw

Twin 2.5" would be more than ample, or twin 2.5" that feeds into 3.5" at the most for your setup

Much bigger would just create drone/noise etc but offer no gains

Well since the aftermarket dumps come out at 2.75" it seems silly to go back to 2.5...but I understand where you are coming from Ash as 2*2.5s flow the same as a 3.5. I have thought alot about this.

2.75" and 3.5" Pipe and exhaust components are hard to come by...3" is very popular and I would imagine i would have more of a choice with mufflers etc. I have never seen 3.5 inch mufflers for sale anywhere, the only ones i know of are Benno's hand-made ones in this 3.5 systems...they could be slightly out of my price range...

So not much of a difference. What im asking is where I might be able to find mufflers that are good for twin setups, compact cats, and also 'X' joiners to act as balance pipes.

Cheers.

[GeeTR]

2.75" and 3.5" Pipe and exhaust components are hard to come by

SMB have half a dozen 3.5" -> 4" cannons, mids and offsets.

[Duncan]

2.75"/70mm is easy to get from truck zorst places, they use it commonly

[femno]

SMB have half a dozen 3.5" -> 4" cannons, mids and offsets.

Thanks man, that was exactly what i was looking for.

Its amazing how you search and search on google and you never find places like that!

[GeeTR]

Clearly a Google conspiracy haha

[GTS4onP]

lol or you could buy the exhaust off my GTS4' I'm wanting to change to a single 3" pipe

genuine full veil side exhaust, is 3 inch from down pipe to b-pillar then a short 4 inch pipe before it splits into 2 3inch pipes that run the rest of the length of the car finished off by 2 stainless mufflers

[bigmikespec]

Hey all,

Over the holidays im going to make up a twin 3inch from the dumps back for me GTR, and after searching i have a couple of specific questions.

Now im wondering what mufflers people have used at the rear as twins and where to get them. I want to use stainless ones. Brands and body size.

Id also like to know if and where I may be able to get the smallest cats possible instead of using the big conventional bolt up type cat that everyone uses on a single. Weld-in ones would be ideal, no need for flanges.

Balance pipes. Are they a must? I notice none of the jap units have them but is it because they are supposedly tuned-length? I understand it would be difficult to get the pipes the exact same length...If not will there be any power loss and is it possible that the exhaust will be more droney than usual if i dont have them?

Im in VIC so if anyone can recommend any shops that would be great too.

Yes i know theyre going to be loud so I dont need any advice in that

Thanks in advance.

Mat.

Hey mate,

How did you end up with the exhaust?

Proper twin systems do not seem very popular at all it seems a bit strange. You would think that twin 2.5" or twin 3" would flow better than a single 3.5" due to the pipes not merging.

Mike

[Marco-R34GTT]

2.75" and 3.5" Pipe and exhaust components are hard to come by...3" is very popular and I would imagine i would have more of a choice with mufflers etc. I have never seen 3.5 inch mufflers for sale anywhere, the only ones i know of are Benno's hand-made ones in this 3.5 systems...they could be slightly out of my price range...

3.5" muffler here..

http://justjap.com/store/product.php?produ...at=0&page=1

[femno]

I didnt end up making one, as a Jap branded one came up for sale instead, so I just bought that, rather than making one.

Theyre not popular because to make one is very expensive, materials and time wise...and they are very hard to keep quiet for some reason.

The good thing is that I went from 314kw to 335 just by changing to this exhaust LOL.

[bigmikespec]

I didnt end up making one, as a Jap branded one came up for sale instead, so I just bought that, rather than making one.

Theyre not popular because to make one is very expensive, materials and time wise...and they are very hard to keep quiet for some reason.

The good thing is that I went from 314kw to 335 just by changing to this exhaust LOL.

That is a pretty good gain. What size exhaust did you use previously and what size did you go to on the twin system?

Mike

[Nismo_Boy]

I think twin 3" is way too much pipe and be droney as hell, not to mention very hard to package up tight in the underside of the car.

It's a tight fit.

twin 3inch from turbo into single 4inch at diff.

Only vid I have

[bnr#@]

I have a feeling that whatever power you gain by having a full split exhaust you loose by having all that extra weight... power only deals with acceleration, weight deals with acceleration, braking and cornering. I know id rather have less weight then a bit more power...

Edited September 6, 2008 by bnr#@

[femno]

Yeah its a very tight fit.

I previously had 2 x 2.5 into 3, 3inch cat, HKS super dragger catback, which was 3.2 off the back of the cat getting bigger to 3.7 before the rear muffler.

The current exhaust is twin 2.5 all the way through.

I also had a really sizeable boost increase of 1.2 to 1.5 without changing anything else which was ideal.

bnr, the exhaust is really not that heavy. It is light but is still quality stainless with a suitable grade so it wont crack etc, it wouldnt be that much heavier than a regular good quality single with all of its mufflers etc.

I should post up pics. The exhaust is a true work of art by the japs.

And the note is so insane that is worth every penny and gram of weight.

[bigmikespec]

Yeah its a very tight fit.

I previously had 2 x 2.5 into 3, 3inch cat, HKS super dragger catback, which was 3.2 off the back of the cat getting bigger to 3.7 before the rear muffler.

The current exhaust is twin 2.5 all the way through.

I also had a really sizeable boost increase of 1.2 to 1.5 without changing anything else which was ideal.

bnr, the exhaust is really not that heavy. It is light but is still quality stainless with a suitable grade so it wont crack etc, it wouldnt be that much heavier than a regular good quality single with all of its mufflers etc.

I should post up pics. The exhaust is a true work of art by the japs.

And the note is so insane that is worth every penny and gram of weight.

Pics, yes please.

Mike

PS: what Jap brand exactly?

[femno]

Pics ill post up next week when I have it on the hoist again.

HKS.