JRSC is the way to go for a DD. If you want more peak power then go turbo. Turbo lag is a SOB but man those peak numbers are nice. The JRSC torque curve is so nice its hard to go away from it once you feel it come online so early. Yeah the LHT mod will let you take it up to 12 psi. If not, go for 9 - 10 psi w/o LHT.