Originally Posted by Alpine3
Sport Package you get the sport seats with sport wheels. M package you get the logos, thicker wheel, M package front and rear bumpers, M package side skirts, and different M package wheels.
That's not exactly correct. On a 2008 135, the sport package included the shadow line trim, increased speed limiter, sport seats, the thicker sport steering wheel w/ M logo, and a shift knob w/ M logo assuming you have a 6MT. The wheels were the same 5 spoke wheels that are on the non-sport package 135.