neither mod is really necessary. but if you are really adament on getting a BOV, then I recommend the Forge. Its nicely built and its one of VERY FEW bov's for the rex that hasnt caused problems. not to mention it sounds pretty nice. Also, you dont need a turbo timer.... the car is built to not need one.. Just dont race someone and then turn off your car immediatly afterwards
But, once again, if you are adament on getting a TT, then get the Blitz TT DD. Its a turbo timer with a built in digital boost gauge. atleast this way you have some sort of function coming from the part.