Yeh i got one of these too, i thought the quality was great for the money, but too found the problem with the poor fitment to the head.
I am running a GT30R and the compressor housing 'JUST' clears the cam covers and the exhaust clears plenty (have heat bag also).
I feel the turbo sits rather high in my engine bay but it will be just enough, not to have to worry about it, maybe i will cut down the height of the collector???
im struggling to slot the holes out atm though, can't find a die grinder bit strong enough to bite through the stainless.
also what do you mean by cut slits beside the ports?
how are you bracing yours?
I am running a V band wastegate and therefore will be cutting off the flange anyway.