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Round top vs. Flattop SU's for 510


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I tried searching the forums some but couldn't really find anything specific so I thought I would just ask. My question is are there any differences performance wise when looking for round top or flat top SU's for the 510? I know for the Z, people consider flat tops the devil. I have been looking into getting some SU's for my 510 and need to know if I should focus on one or the other, round tops do look cooler to me though haha.

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As long as they are 38mm and need two bolts to attach to the intake either is fine. The 38mm flattops do need very minor work to de-smog. The Infamous flattops are found on the 260 Z car and are 45mm (??) and use four mounting bolts and are not really fixable.

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