Our local shop is about double the cost of Dr. Diff and quality isn't as good. Not to mention the one shop has a nasty attitute. I try my best to keep my dollars local but on this case it was not worth the grief.

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.