Not too loud. Louder (by far) over standard, but sounds good. Especially in tunnels
Build quality is excellent, and the fitting instructions a six year old can follow (they look like a six year old drew them too). Just spend a bit of time sorting out the hanging position-being moving mine about today, and now seem to have got it where i want it. Not touched the jets, but it is fuelling fine.
Bought it at the NEC last year for an obsceney LOW price. Owner rides a Baggi, so my cut deals for other owners.
Would post some pictures, but have been informed i have exceeded my limits (sorry!).