Tial and HKS will be my choice as well on VTA. but usually for Evo's, VTA really effects the drivability.

I have my greddy type-S on recirculate, but once you start running more boost then the stock, it'll hold at full WOT, but you'll have some boost surging and RPM issues at half throttle boosting on Evo's.

I believe the Karman Vortex is same on most DSM and Evo's, but with little more restriction on DSM's.

You could try Dual BOV, they tend to solve some of the problems, but really the best way is 1g crushed or even Evo MR valve on your DSM.


Another way is bit more expensive, but getting an AEM EMS, a standalone ECU. That'll eliminate the MAF sensor all together.

That and MAF relocation, but I wont get into that... that's more costly and not very effective considering the Standalone option.