Tire diameter is ok IMO. There's a large range of enthusiast tires sizes to cover. You'd basically have to break them up into 18/19/20 and then go from there with widths between 265 and 325, and 30-40 profile.
No idea how loud or quiet this will be. I assume it's similar to the Borla one, and does mate up to 2.5" pipes. Based on the quality of other Borla products, I would assume quality is excellent.
I had looked into it because I was concerned whether I'd like the X-pipe tone of the FP touring...
Base GT master cylinder has more front bias and is the same as the GT350 cylinder IIRC. Not sure why the PP cylinder changes the balance more rearward, maybe because of what you're noting about the sensitivity at light pedal?
I agree the 4-pistons are fine for street driving. Wider, stickier...
Gotcha. You have a lot more experience and are going harder than me if you benefit from that aero you've got on there.
What headlamps are those?
Does that hood cool well or is it just for looks? GT500-style bumper definitely looks like it lets in more air.
I agree with your take on the GT500. I stared at a CFTP on the showroom floor that was unsold and passed. I couldn't bring myself to pay Porsche money for a Mustang, even though I truly believe the S550 platform is excellent.
Regarding M1 vs modding, I ended up deciding on modding just because...