there is actually some good tomos info on this thread, congrats!
I would agree with Jbot that the hi-hi is a bit much, Id swap to the stock head with out a head gasket
and yes as stated 38 is good on a stock a35 cylinder! Honestly i usually get 36-40mph with a biturbo, the small difference really comes from the condition of your rings, so dont stress about it while your top end is completely stock
Also anyone complaining about the Hunter pipe has clearly never ran one, they hit like a circuit then carry like a larger pipe, you wont find anything better unless you get into the more expensive pipes!