It's not that Mustang dynos have more parasitic drag, but they add resistance at higher speeds to simulate wind resistance. Just like when you go down the track. Dynojets are old technology and do not do this.
Basically what it comes down to is this: If you want to tune your car to run it's best numbers at the track, use a Mustang dyno. If you just want a dyno sheet to brag about, go with the Dynojet.
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1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer
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