R31Nismoid, to clarify I am after a minimum of 320awkw (not rear wheel as you mentioned), so that would equal approx. 370rwkw (I think) but I would like the scope to increase power later on if I desire. So wouldn't that make the Garret GT2860R-5's the better choice? My tuner also recommended to go for that or the HKS 2530's. How much lag are we talking about with the -5's? Wouldn't support mods like poncams and adjustable cam gears counteract this?
I posted a link to the Garrett turbos on the previous page that make available an install kit which totals $2,000 less than the HKS equivalent.
HKS 2530 full install kit=$4,560 + Actuators=$300, Total=$4,860.
Garret GT2860R-5 inc. Actuators=$2,420 + Install Kit=$440, Total=$2,860.
Is there something else I would need to install the Garretts?