I have the stage 1 upgrade and the check engine light came on at around 150 miles. Not sure if this related but I changed the plugs to NGK Iriduims and the light went out not too long afterward. Popping on decel is normal.

Last edited by JFP; 29/06/17 07:44 AM.
1959 4/4 - sold
1957 +4 - sold
2017 M3W - sold