[lethal_vr4]

First of what I have:

Stoptech 355x35mm kit (note only used on track once... mainly for show on street car)
Pros: Larger diameter rotor (by one inch)
Stiffer Caliper (brace that goes in the mouth of the caliper on ST's)
Cheaper pads
Cons: Replacement rotor are ~2x cost
Harder to change pads at track (have to remove bridge)



SCE Brembo kit with spacer between caliper halves to allow a thicker rotor.
This allows me to run a thicker two piece Coleman rotor. (track setup.. get's regular floggings)
Pros: Larger thickness of rotor probably a bit more heat dispersal.
Cheaper rotors
Larger pad selection (I believe)
Easier to replace pads
Single caliper replacement is a lower cost and more readily availble.
Cons: More expensive pads
Modified Studs, required large wheel spacer to clear larger caliper

Summary:
For track use I think the StopTechs are eqiavlant to my modified Brembo's in everyway with a slight nod to caliper stiffness for the ST's. Intial cost of the ST is more but I think that the pads price will make the ST actually cheaper in the long run (have to run many, many set of pads to break even). However I do not know the amount of rotor wear for equal track conditions on the ST kit. My Colemans (cryo treated) last forever.

One the street between the kits the only thing you will notice is a lighter wallet.

Max above has great comments and I almost buy that Stoptech's *track* test each caliper and match them per application.... my personal opinion from when I visited them with Philip from SCE is that they do limited testing, the rest comes from track data from teams they supply breaks too. My "Big Reds" (I.E. Brembos) do indeed transfer more braking torque up front, whether ST's are any better is anybodies guess. Once you modify the car's weight, weight balance, spring rate, dampning, pad compound, tire preasure/compounds... and yes caliper piston ratios brake balance changes anyway.

*Probably more math then anything delevoping the ST kit for the 3/s.

I'd call Philip at SCE.. he is much more knowledgeable then me on brakes.

BTW Wheel choice will be very important on either kit, as they both are fairly massive.