What is this magical difference that when using the exact same supercharger, exact same engine, exact same manifold, and similar tuning in the R8 that accounts for an extra $6000.00? Nothing. Not a damn thing except an R8 tax because the car is more expensive to begin with.
The R8 kit due to utilizing so much of the same hardware should push the price down for both kits as it means APR is buying a larger volume of the same supercharger. They even use this same blower on the 3.0 V6 as an upgrade for the S4 so what in the world are you paying for other than blatant greed?
APR's stuff is brilliant. Their tuning is awesome along with the reliability and this is a great kit. However, this is the same load of BS VF-Engineering pulled when they priced their R8 4.2 FSI supercharger kit at $25,000.00 when it used the same hardware as their RS4 kit (now seemingly abandoned) at $17,600.00. It's an artificial tax folks and we shouldn't put up with it.
At this price point one can opt for a twin turbo kit from a couple of vendors that will offer greater power and torque for similar money. MRC Tuning holds the R8 V8 4.2 FSI record with their single turbo Garrett GT45 based kit that will no doubt outperform APR's offering which uses the Eaton TVS1740 simply to keep costs down between platforms as the RS4/RS5, S4/S5, and R8 now can all share the same blower.
Dyno numbers, acceleration comparison, and video below. Yes it adds a good amount of power but APR is price gouging. People will pay it of course that is unless they are educated consumers.