I note weltmeister/revo do this with their 996 TT upgrades, it is easy to switch the fuel pressure regulator please and what are the costs/benefits ??

 

You would need to upgrade to a 5bar Fuel pressure regulator when you put in the GT640 kit. The cost of the fuel regulator is around $150. It is fairly easy to install if you have small hands. In my opinion its better to have someone install it for you.

 

Just did the 5 bar install, not too bad, but not fun.

You can get them for a lot cheaper too, PM me