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+1 on the Motordyne. Is this for a Rev-up or Non? The MREV2 will be more beneficial on the Rev-up and you can add the spacer later. On the non rev-up, just use the spacer.
The Skunk plenum spacer is very tall and will not let you use the factory engine cover. Look at the Plenum Spacer Shootout results on Motordyne's webpage.