the sliding hi flow turbos can flow power upto 260rwkws but you will need to upgrade your cams to perform this the gcg hi flows don't really know much about them but because they are BB might abit more power that's my 2 cents
yer dude I had the same problem I lived with the problem for about 4 months then I got myself a cheap pfc and bang the basic factory default maps on the pfc worked fine fixed all the retarding the stock ecu was creating I feel the extra power much more now best invesment I ever made buying the pfc go apexi!!
well i know my car when it was stock it would boost in 1st but after i added all this mods like you said wont boost but if i rev it too about 3500rpm i can take off with full boost.