B16A3: 160hp @ 7600, 111lb-ft @ 7000
B18B1: 142hp @ 6300 (140hp for 96+), 127lb-ft @ 5200

less torque, and the peak is 1800 rpm later.. :ugh: if i were you, i would do everything in your power to get your money back. this whole scenario sounds a little shady though. why haven't you confronted the seller already?

one last comment, those of you referring to the GS-R engine as the B18C, you should know that that is the JDM SiR-G engine. the USDM GS-R engine is the B18C1.