I have a Busa powered Seven and the car is really loud. I was looking for a quiet exhaust to install on my car. Not required by the race track, just that it is so loud a need earplugs for any ride longer than 20minutes.

I'd like something that wouldn't rob me of too much power.

Quiall make some good road legal cans that give good power... sure they do one that will suit a busa



They also ahve a nice sound as well, but still within the db limits

Original Busa exhaust?

the zx12r exhaust is good as most bikes have 2 cans so each can isnt really dsigned to run on its own whereas the zx12r only had 1 can.

I had a 6" x 26" can made to replace my 5" x 24". It was 5dB quieter with my R1 engine. How much noise do you want to lose?

I am telling you now, nothing will give the power of a quill and road legal noise levels..

Its even e-marked come MOT time...

http://www.quillexhausts.com/

Second place after that would be the Laser Hotcam by Jama which has a better sound but has a db killer to remove and refit, allbeit one that actually works...

The Laser gives better power with the restrictor removed, but is not as quiet even with the restrictor...

i don't have a specific db target. I just want to get the car a bit more road friendly.

I guess losing around 5db would be a good start.

What about those Remus exhaust, are they any good?

Although a good road legal bike can should get you around about the required limit, dont forget that road legal on the bike doesnt by any means guarantee it will be road legal for SVA, as bike noise tests for road use are measured totally differently to how they measure it at SVA (a driveby as opposed to static test). IMHO though, there's no substitute for size, and from what Ive seen a large 7" custom built can generally quietens things down more than a bike can is capable of doing simply because the design of the bike can is compromised by how big it can be whilst still fitting the bike.

cheers

Chris

[Edited on 31/5/06 by ChrisGamlin]

Hi

Had my car db tested last night thanks to 907.

the zx12r has a R1 can this measured 96 db @ 7000rpm and 99.4 at 9000 rpm which i think is very good.

my blackbird with gsxr 750 carbon can measures 99.9 @ 7000 rpm and 105.4 at 9000 rpm.

i would reccomend the R1 can its quite on the road you here more engine than exhaust.

not sure how it effects performance though, im sure someone will comment for you.

The R1 can is pretty good and you can pick them up on ebay fairly cheaply, although it has a couple of weaknesses. Firstly it is baffled so is a bit more restrictive than some cans (although its not that bad, mine had 137bhp at the wheels), and also judging from both mine and a mates one, they tend to start getting noisier with age, I guess because the packing blows / burns out over time. Also bear in mind that the blue anodised ones have titanium inlet/outlet pipes so needs someone who can weld it if you want a bend on the end

[Edited on 31/5/06 by ChrisGamlin]

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Originally posted by G.Man
I am telling you now, nothing will give the power of a quill and road legal noise levels..

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G.man, are you sponsored by Quill or something?

I did a back-to-back seat-of-the-pants test with an R1 can and a 24" x 5" straight through can a few months ago. The R1 can was several dB quiter (can't remember off the top of my head). The jetting was done to suit the straight through can so with the R1 fitted, above 9000 RPM it coughed and splutterd quite a lot. The r1 can is fairly quiet but a bit restrictive. For best results, get a large straight through can.

quote:

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Originally posted by gingerprince

quote:

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Originally posted by G.Man
I am telling you now, nothing will give the power of a quill and road legal noise levels..

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I thought the Quill's were only quiet at low RPM? Are they a straight through can with "clever" noise damping, or a baffled exhaust with noise-addening? (good word!)

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Well for every 3db wich you could strip it down, you have taken away the half of the sound energy..

Sow the first 6 would be easy but then you would be really really annoying the engine..

That saying i have no bloody idea how much noise my system makes.

I have the V4 engine from honda and have putted one original can per cilinder bank (2 cil.)..

What would the noise be? Lower or higher?

From what i can hear looks like the induction / engine noise wins from the can...

also it looks like the induction noise is only there when changeing the throtlle

saying that it could be different @ 11.000rpm..

Tks