(05-07-2015, 11:04 PM)warrior Wrote: I could be wrong but I seem to recall that there are no noise restrictions at the TT.

The regulations I found on line (which were for 2014) say you're right, no noise limits for Supersport or Superbike machines.
There are no noise limits in F1 either. F1 cars are quieter than they used to be because of the turbos taking as much energy as possible out of the exhaust.