no need to talk to me unless he wants it installed, you guys covered everything. good points.

B18C5=ITR USDM motor
All TYPE R engines come with a Limited SLip transmission, a closer Geared Tranny, More aggressive Camshafts, better flwoing intake manifold, higher compression pistons, and a better header. those are the main differences between a B18C1 and a B18C5

Basically, depends on your budget. if you have 8-10K tp spend, K series.
if you have $6000 to spend, do an ITR swap
If you have $5000 to spend, GSR swap
you get the point. what is your budget that would help us out alot more