...i have recently purchased an A-Spec manifold and downpipe, i was told its the "old style" (i suppose it meant the long runner, rerouting WG to the DP), it has a V-band flange for the wastegate, and a PSR 45mm Wastegate was installed.

...now i have an offer for a HKS GT Wastegate, v-banded, will it fit or mismatch?

 

No sir. You will need to cut/weld the manifold to suit your needs. PSR wastegate = old T3 style manifold. That was prior to the long/short runners.

 

ok, thanks for the info. Are there any wastegates besides the SPR that will fit without modify the dp...?

 

As far as I know nothing else is interchangeable.