exgmguy - Where are getting the custom tune & chip from? I'm curious as I'm looking to get my 331 dialed in and having my JMS (autologic) chip properly tuned.
As far as the Mustang Dyno goes, can't they adjust all sorts of things like roller resistance? If this is right dyno I'm thinking of, I guess it depends on how their dyno is setup when you strap your car on. Anywho, I'll guess 405 RWHP.
Good luck!
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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