You'd have to change the whole rear bumper to get a 1M diffuser to fit. Basically you'd have to get a 1M rear... but that's wider.. so it wouldn't fit on the car. The shape of the diffuser is just different on the 1M so it won't fit into your regular car.
Most quad exhausts on this car have the pairs of tips spaced further apart than the 1M version. I honestly like that look better, but I'm not sure if there's an option other than Inside performance where the tips are all closer together like on the 1M. The catch is that Inside Performance are in germany, and I'm not sure how to order for the US or Canada.
I think Hartge sells a non-CF diffuser for use with their quad exhaust. 3D design also makes a regular-looking quad diffuser:
Inside Performance is the only company i know of that makes an exhaust and diffuser for a more 1M looking exhaust setup, with the tips set in closer together. They offer a diffuser in plastic or CF.