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My "StangTech" chromed racing lug nuts from JC.PENNY were good for 35 RWHP on the dyno but MPG fell from 25mpg to 7 mpg.So I just ordered their in-line gas de-conflagalator by Ronco which is advertised to get mileage back up to 45+MPG.
For maximum performance, you need to get yourself a set of Cross Drilled Brake Lines, and add Muffler Bearing! Go to http://kalecoauto.com/index.php?main_page=indexand get only the best for your beloved Pony.