70 duster: updating, and a no-dough pro-touring makeover

autoxcuda said
Do those 76 caliper have a different bore that make the pedal a little stiffer?

It does seem like the later A-Body caliper was supposed to have a smaller piston. Seems like Ehrenburg like them because they made the pedal harder.

autoxcuda said
The Dr Diff kit? I think those caliper are 2 piston floating. I'd think the ARengineering viper brembo kit is more performance that you could grow to about any level of perfromance with the car still barely streetable. I'm sure the Dr Diff kit is good. Is it a lot cheaper? That's a big factor.

Dr. Diff's kit uses the 2 piston pad guide (PGC) PBR calipers off a Mustang Cobra, the C5 Vette calipers are a 2 piston pin driven (PDC) PBR caliper, similar to the Baer GT or GT-Plus kit. They are a bigger caliper, with a bigger pad. And yes, both calipers are a floating design.

I am not aware of anyone making a kit to bolt a C5 Vette caliper on a Mopar. I have been building one of my own, but not to sell. The C5 caliper seems to be a good compromise between performance and cost. They wont work well for a track car (the Vette guys go through lots of pads and rotors on track days), but it should be more than enough on a street car.

Money not object, all out car (street or track), I would jump all over Andy's 13" late Viper caliper kit, with the Baer 2 piece rotors. All the performance you could ever need, and not a downside I can think of (other than cost).