With stock heat exchanger and the NW 61.9 pulley I see approximately a 50F increase in AIT's from launch to completion of the 1/4 mile. By the way, this is the same as when I had the NW, Eurocharged, and no-name brand heat exchanger installed. As a result, I'll be leaving the stock heat exchanger and shroud stock.

Shoot me a PM with you email address and I'll send you some datalogs before the nitrous. Attached is a zip file of the 11.3 run with a 75 shot running the EC 61.9 SC pulley, Single NW, 550cc injectors, stock HE, SL55 pump, and Buckhead Imports tune.

Take a look at the link below, as it's what I think you're going through.

https://www.crossfireforum.org/forum...ved-again.html