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Exhaust system help

vxsr33

By vxsr33,
in Engines & Forced Induction

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vxsr33 Proficient

vxsr33

Posted
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Hi all,

 

I'm making around 250rwkw in my r33 gtst with a hypergear op6 highflow.

 

My exhaust of right (3 inch system) now is a bellmouth dump pipe, to venom 100cell cat, then straight to a jasma cannon. However the jasma cannon reduces to around 2.5 inch.

 

This setup is fairly loud but not too bad when cruising and light throttle.

 

I want to replace the cannon with a piece of 4 inch straight pipe. Mainly because i want to remove the 2.5 inch restriction, i like the look and i can do it fairly cheap. I don't want the exhaust to be insanely loud or drone heaps. A little louder than now is ok.

 

If i install a hot dog resonator after the cat, will this be enough to reduce noise a bit and keep drone down? Or will i have to install a different type of muffler?

 

 

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GTSBoy Grand Master

GTSBoy

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'zactly.  There is a logical limit to how big a muffler under the floor can be.  You obviously need 3" in and out, and it is quite likely that you will need it to be centre-centre because it will be going in in place of a piece of straight pipe.  So your typical oval mid muffle will only be so tall and so-so wide.  Your main degree of freedom is the length, and there will only be so much freedom there.  Get the longest one in the catalogue.

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vxsr33 Proficient

vxsr33

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I just checked my exhaust and the way its the piping goes doesnt allow space for a mid muffler.

I also drove the car with a straight pipe (was doing hicas delete so had to drop rear exhaust) just to see how loud it was. Needless to say its unbearingly loud, i got about 20 angry looks even though i drove around at low rpms.

Can anyone recommend me a rear muffler ( preferably dual tip ) that flows well but is quiet?

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Piggaz Grand Master

Piggaz

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5 minutes ago, vxsr33 said:

I just checked my exhaust and the way its the piping goes doesnt allow space for a mid muffler.

I also drove the car with a straight pipe (was doing hicas delete so had to drop rear exhaust) just to see how loud it was. Needless to say its unbearingly loud, i got about 20 angry looks even though i drove around at low rpms.

Can anyone recommend me a rear muffler ( preferably dual tip ) that flows well but is quiet?

http://www.smb.net.au/ovalmufflers.htm

They will do a twin tip if you ask

I added a photo of a single tip, 4 inch offset in, centre out for reference. Can be made I any length you want. 

IMG_2027.JPG

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vxsr33 Proficient

vxsr33

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... they work and they're quiet? An extra $100 is nothing. 

$100 is a fair bit when your a uni student with limited workshifts. And most of the prices i am seeing are around $450.

But i guess you get what you pay for. Ill give them a ring next week.
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vxsr33 Proficient

vxsr33

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Or leave it as is. At 250KW you are not going to gain a lot from going to 3in. Save up til you can afford a good muffler.

The main reason i want to change is the drop to 2.5 inch really bugs me and I'm over the look of the cannon.

Not expecting any noticeable performance increase.
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  • 2 weeks later...
Kinks Grand Master

Kinks

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Don't cheap out on exhausts.

I spent $450 on a catback once that was f**king awful.  It was so bad I chopped it up with an angle grinder rather than attempting to sell it again.

 

 

 

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  • 1 month later...
AngryRB Grand Master

AngryRB

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I added a helmholtz chamber to my HKS system and it super quiet now so you can keep a loud ass cannon still, expensive big mufflers not needed.?

Edited by AngryRB
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AngryRB Grand Master

AngryRB

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It's pretty amateur but it works, I'm gonna clean it up alot more and paint black.. just wanted to see if it worked first..

20170611_173637.jpg

20170611_173715.jpg

Edited by AngryRB
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chiksluvit Experienced

chiksluvit

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And the pipework looks 3 inch while the his exhaust is 3.5 if I'm right?

 

Was looking at this before but had another idea, joining the end of the chamber the end where it's capped to the actual exhaust (without actually drilling through. Just not sure if it'll still be effective that's all)

 

Saves the hassle of having to find a way to mount the chamber

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