I would ask just how wild you were going to go on the engine... a mild 2.5 vs a mild 3.0 I'd go with a mild 3.0 because you'll get more HP and TQ at a useable RPM. If you're going to go full bore wild, high psi, high N2O shot, the 2.5 will have a better chance of holding itself together slinging around the smaller slugs. Of course, if you have the money to buy a stronger crank, Ti rods, and forged pistons... 3 liter... bigger is better .

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