Hi guys have u came across this?? I own fg mk2 turbo . Standrad tyres and wheels make 285rwkw to 300rwkw, 285 constant all times as f6 cooler get hot drop power. Now problem is I upgrade to 20 inch wheels and tyres rear 275/30/20 with achiles and I upgrade process west stage 1 cooler and put back on dyno and is showing less power, 278rwkw. Loss like 20 kw. Tuner say is coz wide tyrres and they sticky. He say dyno just read low bt u havent loss and power. I was hoping to crack 300wkw. Bt nw dats happen?? Any ideas or similar experience???