I'd go(and I did go) ESS for many reasons, in order:
-most proven performance and reliability
-possibility of trasfering money of your N/A tune towards the s/c kit
-better costumer services(in my case they've been top notch)
-easiness and value of resale
-better looking manifold
I don't think you can go wrong with either, but one thing I know is that I've never seen an ESS costumer unsatisfied of their purchase, can't say the same with VF!
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