With the manual GT, the rear axle ratio is a more aggressive 3.73 vs the standard 3.55.
That is a 5% increase - however, the PP rear tires at 275 40 R19 are 2.6% larger in diameter vs the standard 255 40 R19s.
That means the effective axle ratio is only 2.4% higher and probably barely...
I had it on my V8 R8 1st gen. Not a lot of difference and it started leaking after a while.
Very pricey to replace so I got coil overs from K&W - much better.
Didnt order Magride on my GT premium manual. No PP either.
Might do a full overhaul later.