I'm new to the forum, but have been reading it for a few months now and it's great. I've gained a lot of good info here. Anyway, I drilled out my exhaust on my 950 tourer last night. I used an 18" extension with a uni-bit that went up to 1 1/8". I opened her up to about 1" and man does it sound good. Not tool loud, but a nice low rumble. I'm thinking about drilling the airbox next, but I'm concerned about having FI issues?