Saleen4971
New Member
as has been said, the impreza RS, TS, etc. is N/A, the WRX is turbo, and the STi is also turbo. they use a bypass recirc valve like most blown stangs do, because they use a draw-thru MAF. some of them have been tuned to utilize an atmospheric BOV, but throwing an atmospheric BOV onto an otherwise stock or stock tuned WRX/sti will make it sputter and run liek crap between shifts when teh BOV opens and the metered air doesnt go into the motor.