Alot more than I ever intended lol! 5-6 grand is a good ball park estimate.
If the heat exchanger and bigger reservoir tank don't work, I guess methanol injection would be my next thought on it. Haven't heard of a interchiller? Sounds expensive and labor intensive! Especially dealing with frion.
I just got my scanner set up the way I like it. With all the PIDs, gauges and charts I like to Monitor. I actually bought my scanner layout from goatroap garage online for 5.00$ and then just tailored the list for what I want/ need to log.
Im still learning on hp tuners and using it to dial in part throttle fueling with MAF and VVE tables. I barely learned how to filter data! I was trying to tune my maf and everytime i released the gas pedal ide go super lean and my numbers would be way off. I filtered all the numbers out that included no throttle or decel throttle and got way better results tuning.