a few years ago me and Mike did some back to back logging of our cars in Chatham (Mine: Stage 2+ K03 TFSI on stock IC and Mikes Stage 2+ K04 with APR Cooler) on a warm day. Tthe stock IC was terrible in comparison iirc mikes car was running around 50oC cooler, and more importantly his IATs recovered back to normal really fast, whereas my stock cooler took an age to recover