Because correct for this car, less money, fewer parts, and better torque where I'll be driving it. Not to mention there is limited space for a passenger side pipe along the fuel tank.
I get why,but the less space thing I had an issue with on an M body as well. Shift the tank over,and theres all kinds of room. But I went single ex as well,just bigger. 2 1/2 I think. Factory for the M is a choking 1 7/8.