I was the really noisy one when Rhys did the noise test. I decided that I should comply and in future it will be a lot less noisy, maybe only 85db?
The reason I know how noisy its going to be is because today I paid the GX Tuning Store a visit. I learnt (or learned?) a lot about tuning (and quietening) these engines.
As far as exhausts go, have a look at what he produces. He is one of the authoritative sources of on this subject. I had welded three shortish sections of flexible exhaust pipe into one to suit the installation in the beast. It was just the job but not conducive to good performance (to say the least) and it looks a bugger too so its in the skip.
I bought a new exhaust header and a new muffler.
I put together a new engine for the Wee Beastie as you may know but its coming to pieces tomorrow to have some new bits fitted.
I will start a new thread on tuning the GX200 which will both clarify a few points, cost a bomb and cause others to think that it is unfair and against the ethics of Cyclekarts GB.