These two questions are related to the engine so i thought it goes in here since im new, but if it goes somewhere else feel free to move it there, thanks. First question, do the first gen SIR1 b16a have the fan switch located on the back of the block like all the other obd0 motors or is it by the thermo housing like the rest of the obd1 and obd2 B series motors?. Second question, are the first gen SIR1 b16a identical to the second gen SIR2 b16a, what "exactly" makes the obd1 b16 SIR2 have like 3-4 more torque and 10 more hp then the SIR1 b16a?. I was thinking, and the only thing i could come up with is that maybe the pistons are differen't, but they suppose to be the same correct?, so then i thought the older manifold style might be more restrictive then the newer one?, or even the cams are "slightly" differen't perhaps? I tryed searching about this and it's hard to find any real understanding of why that is, but either way guys let me know if you got some info, thanks.