TClark24CP Posted February 9, 2013 Report Share Posted February 9, 2013 Shelby's published production data shows 525hp black, black 91 tuned, black 93 tuned. What is the 91 and 93 tuned? I was not aware of this option or the option for one-piece alloy driveshaft. What gives? Also, why does the engine (525hp) not immediately idle down? Do the tuned versions respond better? Can my 525hp be upgraded to 624hp? Lastly, are the inter-cooler fans suppose to run continuously and never shut off? Thanks!! Quote Link to comment Share on other sites More sharing options...
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