Anyone actually sit down and do the math on these swaps?
Honestly don't see the quantitative point.
Yes, i have Jag, its all dependent on what wheels are used as well, the GSXR is also a very light bike so spring rates should be looked at for a "proper" installation. Personally, I don't like the upside down look on older bikes, I've gone for 43mm GSXR1100K forks, right side up and an excellent array of adjustment, these front ends are a very popular mod for classic racers here and retain a stockish look.... Frame bracing is also another thing to factor in, the newer forks and brakes put a lot more stress on the old frames, I also consistently see these front ends used with cheap crappy shocks on the rear...
If you don't care about handling them why even bother...? Yeah, I know, it "looks good"...