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Basic Exhaust Query

Tangles

By Tangles,
in Engines & Forced Induction

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Tangles Grand Master

Tangles

Posted
Posted

Howdy. Just had a (Kakimoto) 3inch centre to centre oval shaped free flowing muffler welded on, to replace the restrictive (Fujitsubo) 3inch offset to centre muffler..... bought the muffler from a wa sau member for $65 delivered so I got a bargain for sure.

Tuner was saying the Stagea needed a free-er flowing muffler so he could get the tune right in the higher rpm area (was pinging up top end as the highflow turbo couldnt flow out enough exhaust gasses thru the muffler, and didnt like to be pushed past 14psi). Now its as right as rain.

Problem: droney below 2500rpm, above that mark when the turbo is in use the exhaust is fine and reasonably quiet (really hear the turbo and the induction noise above 2500rpm and the droney exhaust sound is gone). However most of my driving is in city traffic below 2500rpm off boost, and its a tad loud for my old ears.

What do I need to do to keep the high flow exhaust gasses coming out but reduce the sound a bit when its off boost? I was thinking about a 3inch resonator. However, would another small bodied 3inch centre to centre straight thru muffler be more suitable? ie add a resonator or another muffler just after the cat converter?

what do the resident experts suggest?

cheers in advance

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BeAgLe Community Regular

BeAgLe

Posted
Posted

Hey,

I just had a new turbo back exhaust put on my R34 GTT.

I have an oval resonator between my CAT and muffler and its not very loud around the 2500 mark. By that i mean, its louder than stock, but not illegally loud. The resonator is fairly large so it quietens it down a fair bit... i would recommend one of them... as the hotdog (long and slim) ones wouldnt be much benefit if your looking to lower dB's...

IMO.

Hope this helps.

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