i'm running a d15b7 bottom end, with a z6 head. and of course i have a few other bolt on's(haha, i'm just gonna stick to the hood latch is broken if ya ask ). but the output is very good in my opinion. But the main prob i seem to be having, is trying to run the right ecu. Right now i'm running the d15 vtec ecu and it seems to be very sluggish in the low end. IDK, tunning is a pain in the arse!