I am BPU and only have strict BPU mods w/ a exhaust cam gear. I have always run really really rich. On a 0-160 run I peak at maybe 620 (in top of DP). I never hit over 620 and some BPU's are faster than me so I assumed I'm running rich. I'm gonna double check my BCC - any other suggestions? Oh and I have a custom high flow cat on my DP.