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By installing the Crawford manifold spacer, the powerband is shifted to the left by about 500rpm. Along with an UEL (not EL/Ace) and OFT tune adjustment, it'll probably improve the mid range. Would this make sense on the track though? The mid range should help corner exit, but at the cost of top end. Also, for straight line acceleration, would you now shift earlier, say 7k or even 6.5k, instead of redline?
Or would it be better to install the new red manifold?
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