Guys , i dont know why all are saying about the fuel mileage , here in mexico i Have some OS T1201 MAG tuned with OS 1070SC Pipe and i can get 6+ Minutes , and the Novarossi with 2660 médium header i ant get 6 minutes , we run at 2300 over sea level , and i use 40% nitro and #7 PLUG , maybe im not running that strong like you and it is for i can get that time , my temps are OS 140 C and Novarossi 145 C

Regards