i take it you want more power off the line in your NA.... easy solution.. get a 4 speed and drop the slush box automatic in the trash

stock boost on the turbo om617 is 11 psi i belive and at cruiseing speed 2500 rpm's my boost is 8 psi... the non turbo could possible handle it.. but i wouldnt want to risk more than 3-4 psi with it