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Silencing Exhuast, How To?

WrenchesInTheGears
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WrenchesInTheGears Enthusiast

WrenchesInTheGears

Posted
Posted

ok everyone ive got an r32 gtst with a 3 inch exhuast, decat pipe and large cannon at the back, i think the brand of the system is trust, it is loud and i need to make it quiet for defect clearance,

i have got a cat to put in it so that is that sorted but i still will need to quieten it,

i heard of using a plate cut to the size of the flange at one of the joins with holes drilled into it to limit flow

anyone done this before?

also any othger ideas?

im talking cheap/easy/DIY stuff

cheers

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(OO)SKYLINE(OO) Grand Master

(OO)SKYLINE(OO)

Posted
Posted

You can get a silencer made up for the muffler but make sure it is welded in not bolted in or they can knock it back saying it can be removed and not pass it.

Or

Get you mechanic to fabricate a Resonator in the exhaust system.

Or

Get the stock R32 GTS-T exhaust, put on a compliance cat (non high flow) and fabricate a Resonator if needed to lower the dB level as much as possible.

Once past, return back to how you want it.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

1x Cat

2x Mufflers, and i dont mean cheap ones. you are looking @ $400-$600ea.

No big cannon mufflers

No 'hot dogs'

No decat pipes.

You should be smack on legal. Fix it right the first time, get the exhaust made so it is quiet.

Marcus89 Proficient

Marcus89

Posted
Posted

Had a stupid loud exhaust on my old car returning it back to standard made it so much more enjoyable (although was non-turbo car and only a cat-back exhaust so negligible performance gains/losses to be had). Want to get an exhaust for the 34 but wanna keep it fairly quiet unless of cause i'm going WOT and higher revs.

Shaun O Enthusiast

Shaun O

Posted
Posted

Similar question, I have an RB30DET with full 3 inch straight pipe from the turbo back to a 5 inch HKS super dragger muffler. I went to the exhaust shop today to ask the same quesitons but they were closed, would adding just a single resonator in the middle of the exhaust system make the car quieter and sound a bit gruntier/throatier/deeper? I want a nice growl but it needs to be quiet to pass a warrant of fitness.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

^ forget it. Hotdogs etc etc, pointless on RB's. I've not seen one that does any good.

Piss of the cannon. Put two decent 3.5" mufflers on (might as well increase your 3" to 3.5").

Mine really does sound quite nice under load. Just cruising around, you can barely hear it as im sure most Vic people that have seen it can attest, it's not "camry" quiet, but its as quiet as a HSV or similar just putting around, yet gives a nice little growl when you get up it a bit.

GDZ-14R Rising Star

GDZ-14R

Posted
Posted

I tried forever adding/changing mufflers and resonators on my old S15 to shut it up, and all efforts were pointless. Under advice i gave up and got a HKS silent power catback. Best move ever, stock sound until 4.5k, and nice growl up high. Not exactly ghetto fix, but it is a quality long term fix. The Nismo item is very similar in nature on my RB26, very impressive for a cannon.

Cheap way out is to flange the rear and add a large oval bodied muffler (2.5" even better), may not look pretty, but you should pass with that.

gotRICE? Veteran

gotRICE?

Posted
Posted
I tried forever adding/changing mufflers and resonators on my old S15 to shut it up, and all efforts were pointless. Under advice i gave up and got a HKS silent power catback. Best move ever, stock sound until 4.5k, and nice growl up high. Not exactly ghetto fix, but it is a quality long term fix. The Nismo item is very similar in nature on my RB26, very impressive for a cannon.

Cheap way out is to flange the rear and add a large oval bodied muffler (2.5" even better), may not look pretty, but you should pass with that.

HKS Hi Power "Silents" On RB's are not silent at all. And IMHO, the lower the RPM the louder it is.

I have one on my RB25, and its far from quiet. comparing it to stock sound would be like comparing black to white.

NA_Goodness Grand Master

NA_Goodness

Posted
Posted

I've got a quality JASMA exhaust on my R33, its silent throughout the rev range. Has 2 mufflers and a cat, plus 3in piping. Thats one option. Otherwise, my mate had some success with putting some plates in his exhaust to take it over the pits.

gotRICE? Veteran

gotRICE?

Posted
Posted (edited)
The HKS silent hi power is quite silent on most car models including most skylines EXCEPT for R32 and R33 GTR/ GTS-t

for some reason the exhaust inner diameter for these models is 95mm, for every other turbo cars they're only 85mm or less

Wow i actually never realized that.

I never measured mine, but it doesnt look like it has a 3.7inch inner!

Could be wrong though, id have to measure it. Sounds massive!

Edited by gotRICE?
bozodos Grand Master

bozodos

Posted
Posted

the first time I threw a super drager type rear muffler on my straight pipe ( was called 'megaphone' no idea what brand), and it was kosher, second time went a second hand JASMA exhaust - thinking about buying another reasonably loud exhaust, and swapping over as need be.

chiksluvit Experienced

chiksluvit

Posted
Posted
Wow i actually never realized that.

I never measured mine, but it doesnt look like it has a 3.7inch inner!

Could be wrong though, id have to measure it. Sounds massive!

yeah it does actually, I've measured mine..

the diameter gets larger as it goes to the cannon, 3 inch from the cat to the hotdog, then 3.7 from hotdog to the square flange (longest section), then 4 inch after the last flange...

The HKS silent hi power for EVO, R34 GTT/GTR, silvia turbo are only 85mm all the way... and they're really quiet in comparison

WrenchesInTheGears Enthusiast

WrenchesInTheGears

Posted
  • Author
Posted

ok so thanks for all the replies, i am aware that a muffler will quieten it,

but i am looking for a more cheapskate approach,

i have heard mixed ideas of perferated plates and such anyone done this beforE?

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