GT1999

i figure crossdrilled rotors and new pads and stailess steal lines will run me around 300 bucks, so i figured i can cough up another hundred an get the cobra brake hit because im sure even if the GTs also have 2 piston calipers, the cobra has much more braking power in the 2 pistons that they have , and god knows the way that i drive ill be needing as much stopping power as possible... GT brakes are garbage compared to most other sprots cars... lets be honest.... GTs should come stock with cobra brakes and cobras should come with 4 piston front and 2 piston rear calipers... oh well..... also im not gonna add a power adder to my car, im gonna leave it NA, so now... 70mm or 75.....NA.... what do u think ... also, anyone have any idea on Pro 5.0 or motive performance 3.90 gears... trustworthy.... i think pro 5 is a pretty reputable company, so i figure i can trust their rear end gear craftsmanship