Food for thought: many posts about 15% parasitic drivetrain loss, but me thinks different. Had my 96 Mustang GT dyno'd at GRC Performance in Mission Viejo, CA. about 2yrs. ago. They said they typically see 45 to 55 hp loss on a stick car irrespective of fwhp. In other words, if 15% was correct then a 1,000fwhp would reduce to 850rwhp. Why, if the related components were of comparable quality, weight etc., would a 500fwhp car only lose 75hp?