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Quiete Exhaust, Without Sacrificing Performance?

R33GTS25

By R33GTS25,
in Engines & Forced Induction

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R33GTS25 Collaborator

R33GTS25

Posted
Posted

Hey all,

I was having a look at hitech mufflers which claim to have the same noise level as a stock exhaust but allow the same power output as a performance exhaust... how true is this claim? I really do not want to attract any attention to the stagea im about to purchase but i would like to mod it for more power. Which exhausts can you suggest that will out put the same noise level as the stock exhaust but also allow extra power to be made.

Also which turbo would you suggest to replace the stock one to make about 18 psi. A friend of mine said to buy a 2nd hand wrx sti turbo which could reach 18psi no problem and still spool up pretty fast... what do you think?

sewid Grand Master

sewid

Posted
Posted
I cant read jap... who is the distributor in australia for kakimoto?

Justjap is the official Australian distributor for Kakimoto. I have the O6&R Regu exhaust by Kakimoto and it is about as silent as a stock exhaust.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

92-94 is quiet enough.

Quiet to a level that it cant be heard inside the car while cruising. I can only really hear mine under full song and thats about it. Will keep me out of trouble easily, and thats 3.5"

courier33 Enthusiast

courier33

Posted
Posted

Every 3 db increse the sound volume doubles. I had epa test done with stock system from cat back (split dump and hi-flow cat) and came up to 90.4 db. Limit is 90 db in vic. So 93 db is twice as loud as stock, and 96 db is four times as loud.

I have a Jasma 3 into 3.5" system. Was tolerable with standard turbo, but fitted a gt30 0.86 and bacame a lot louder. I ended up fitting another muffler between the diff and the cannon bit at the back, which only decresed the noise level slightly.

benl1981 Grand Master

benl1981

Posted
Posted

Nice thread.

My kakimoto was ok (3.5" cat back) but I have now added a highflow and is just that bit worse. Slight drone at 2000-2500rpm if loading it up a bit.

Looking to quieten her down. It already has a centre and rear muffler.

Courier - Are you saying you have 3 mufflers on yours now?

Im thinking the SS is slightly louder than MSteel also..

mesmerized Mentor

mesmerized

Posted
Posted

hi-tech mufflers are true to their claim, very quiet without sacrificing performance, no in-cabin drone

i'm running 84db at 4800rpm, only mods are turbo back exhaust, pod filter, FMIC, standard ecu - 188rwkw on stock boost :wave:

courier33 Enthusiast

courier33

Posted
Posted

Yeah i am running three, although ive been told the center one is a resonator. The extra muffler i fitted was one of those straight through chamber mufflers which doesnt seem to have any insulation to dampen out the noise. Instead it used the shape of the inside to cancell out noise. I should have used a straight through with the insulation packing in it instead.

Ronin 09 Grand Master

Ronin 09

Posted
Posted
Hi Nismoid , when you say 3.5" who's exhaust is it and is this on the HR31 or the GTR ?

Cheers A .

His is a 3.5 behind a RB26 in the HR31

Mine is the same twin muffler 3.5 design behind RB26 in R32GTR (slgihtly different shape to fit, obviously)

there are some pics of Ash's exhaust somewhere in here...

I can get some of mine on the weekend

NRV155 Proficient

NRV155

Posted
Posted

Im also after a quiet cat back for my rb20. Ive been looking at Kakimoto but 92db is still too loud. I had a 5Zigen exhaust on my last skyline and was very quiet, however i didnt think too much about it before but i wish i had it now. I dont know what model from 5Zigen it was though. Im not even sure how many models they have.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Mine is a custom jobbie Adrian as Marus has covered :rofl:

So a one off being a HR31... everything is 'one off' for me! Especially exhausts

There are pics in the other exhaust thread (in FI section), cant remember the name but it was only a few weeks old.

sewid Grand Master

sewid

Posted
Posted
Im also after a quiet cat back for my rb20. Ive been looking at Kakimoto but 92db is still too loud. I had a 5Zigen exhaust on my last skyline and was very quiet, however i didnt think too much about it before but i wish i had it now. I dont know what model from 5Zigen it was though. Im not even sure how many models they have.

My Kakimoto is nowhere near 92db.

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