Does anybody know what the size of 911S mag stack for MFI is in MM or how do I know when I look at one. Sometimes when your confronted with a mag stack by itself its hard to say that It is a 911E or S. Also I have ordered a set of 2.8 RSR Mahle high compressipn P&C. any thoughts of going with the orignal factory approach ( 92X70.4 ) or a 2.6 short stroke (92X66). The car will always be a norrow body with 7'S in the back and a max of 215 X 60 or 225 X 55 in that area. Main question is--will I have too much engine with a standard 2.8 to use on a narrow body car or will the 2.6 SS fit the bill better? When I look at pictures of factory 2.8 RSR's they always have big tires and heavy flared fenders. I do not want to be on the edge all the time around corners about to break loose at any second because I have too much power. Thanks Chris R- Gruppe#144 / Early S Reg.