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jdm motors dont have the last digit on the block
sir-g is gsr (USDM b18c1)
an itr motor is just dumb most of the time
the cost does in no way justify the means... You can easily surpass that kinda of power from a gsr with nothing more than CTR pistons (if the dyno's Ive seen are true) - its a 12:1 compression. Throw on some 98spec ctr cams, along with upgraded valvetrain and youve got honda relaibility and easily over the 210whp mark.
Both LS and GSR/sir-g motors are great for boost. LS is lower compression so stock for stock it can take a little more psi. GSR cams are really nice for stock turbo cams, and its tranny is well rounded with a mix of long and short gears. The LS tranny has long gears so you'll sit in boost longer...choosing becomes a matter of preference.
Either way, I'd go b18_
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