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My exhaust was custom built by
Peter Gray, owner and proprietor of Pipemasters here in Brisbane. I
wanted a performance system not a noisemaker, like so many other
aftermarket CBR cans. I contacted Peter and asked him to build me a
high flow 4-2-1 race setup. Turns out he used to race in a clubman lite
category when he was younger and had a very good design which he had
race tested and proven. Basically its a slip together system,
comprising of three sections.
First, a set of CBR
250R
[MC17] headers solely due to them being a
larger inner diameter than the RR [MC22] headers.
Next is the custom
collector. This is the main benefit as it removes a
deliberate restriction that Honda designed into this motorcycle.
Instead of taking the exhaust flow and cramming it into a 4 into 1
collector running undersized pipes, this system runs higher volume
pipes so that the exhaust never has to slow down on its way out.
Finally, the can. I
specifically asked that the end-can keep the exhaust
under the 98dB legal noise limit but it turns out that the system
actually runs under that dB limit anyway so the end-can is a
straighthrough stainless pipe basically.
The power gain is
noticeable but i have yet to get to a dyno to see
actual results. The system also sounds rather good especially when
engine braking and under full power, not annoying and ear piercingly
loud like the Yoshimura or the Roo Racing pipes.
UPDATE: I have had a bung installed into
the collector
so that my Fuel/Air meter can function.
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