Greddy "U" Or stock E.C.U. To control timming?

Koenigturbo

Active Member
Oct 4, 2006
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Oxnard CA
What's the advantage of have the Greddy control timming verse The Stock E.C.U.? What are some of the important tweeks that you should do on a Piggyback? A.F.R. for one, what are the others?? Timming,boost?