Restrictors on a Yamaha aerox

It's a TT, are the TT's any good? Thanks, I'll bare that in mind

 

To answer your question take a look at this link http://www.pedparts.co.uk/blog/leo-vince-gp-exhaust-review-any-good

 

Thr TT's not a bad exhaust but the ZX and Stage 6 are better and will allow you to tune further without the need to replace.
Don't buy off fleebay in this instance go to Pedparts and get the ZX for £99 or the Stage 6 for £91.