The problem with the b20 is not the sleeve. The sleeves are fine...they can hold high compression, high rpm, and boost. The problem is in the OEM rod bolts. They tend to stretch under high RPM loads...that's the weak link. 8k rpm every day is not reliable unless you have at least ARP rod bolts. I'd rather have a B20 over a B18C/B or B16 any day of the week, even if you didn't slap a vtec head on it...just by the sheer cost of the motor compared to the GSR. A B20 costs slightly more than a B18B, and you get more torque. I'm not a very big fan of the B16, and they'll cost more than a B20 for a relatively new motor.