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I have the 74mm cable throttle body on my 2.5. I'm using the 2.5 plenum, it bolts right up. The 68mm throttle body is only smaller on the inside, the body itself is the same size. If you have them sitting side by side it is easy to see. Performance gains? Maybe a little at high RPM's. Maybe a little quicker throttle response. It does change the intake sound for sure. I'm still running stock exhaust, maybe with headers and high flow cats it would make a bigger difference. I paid less than a hundred bucks for it on Ebay, so for that price I think it's worth it. Would I pay $1000 to see if the IDP plenum would make it better? No.
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