I agree with 89ATI, LX XLR8R, and Skyman.
The 70mm T/B is not going to help your car in peak performance, and it will hurt you significantly in low end torque. Even the 65mm T/B isn't going to do anything for you until you get an intake.
With your current mods you really need to work on getting an intake before you get a T/B. Personally, the next mod I'd make if I were you is a better MAF sensor. Then you can focus on your intake, later some head work, and then a cam or at least some roller rockers. The T/B is the last thing you need to be adding, most people don't pick up squat from the larger T/B.
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