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Originally Posted by SiGNAL748
You don't want backpressure. What you DO want, is exhaust velocity. Hence N/A applications generally using 2.25 Piping, and FI applications generally use 2.5-3.0 piping.
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thats assuming youre using manderal bent piping correct? non manderal bent you want to upsize that .25 to .5 inches??