gartracnick

hey guys, bought a type ra the other week was amazing when i first got it but it has lost its oomph now lol. turbo dont seem to be pickin up as well and no where near as hard. just wonderin what may be wrong, seems like its not giving full boost and is more laggy. wheres the best place to take it near guildford/godalming area for a check up. theres a place grd near me are they any good.
also how much do i expect to pay for a cambelt change, as its recently imported and no record of a cambelt so want it done for piece of mind.
cheers