Stick with 2 1/2 or 2 3/4 at the most if your planning to use nitrous. I just did a calculation based on engine size and the ideal piping size is slightly under 2.5. 183.07 is the 7M in cubic inches.
(RPM x Motor Size)/554,177 = Recommended diameter.
(7,000 x 183.07)/554,177 = 2.31"
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Function Over Form - Form Follows Function
88 MkIII Jurbo
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