USDM B18C5 (Type-R) is 8,700 with 190-195hp and think the B18C[R] redlines around 8,900 w/ 205-210hp. There's also differant generations of the ITR engine with the latest version ('00-01) having the slighter better intake cam from the Civic Type-R (3° higher intake duration). Compression ratio is 10.8:1.
B18C & B18C1 (SI-R/GS-R) redlines at 8,200 with 170-178hp and has a 10.6:1 compression ratio.
Gear ratio's are differant and the ITR has a LSD.
As for the car itself, ITR's have slightly beefier suspension and sits about an inch lower stock. 22mm USDM and 23mm JDM rear sway bar while the GS-R has a 14mm. Five lug suspension on all but the '96 ITR (4x114.3) and GS-R's all have 4x100. Obviously the ITR has a taller wing and interior pieces and seats are differant. There is a little bit extra bracing in the unibody itself on the ITR but some weight removed from other areas.
This should keep you entertained for a lil bit
