A review of the RKM Audi RS6 Avant:
Test car specs:
-weight: 1524kg
-power ratings: 594bhp @ 6500 rpm, 498 lb-ft @ 1500 rpm
-odometer: 119.6 miles
-power to weight ratio: 2.53kg/hp
-no rear spoiler, no engine upgrades
RKM's 2-ton leviathan. The RS6 looked like a typical Audi wagon - it didn't look much but boy boy does it pack some hardware. A V8 under the hood? Nice try, but the engine is a 4991cc bi-turbo V10 derived from the Lamborghini Gallardo. It belted out 572 bhp & 479 lb-ft. Press release kits for the car claimed the RS6 Avant is capable of 200+ mph, provided the 155 mph speed limiter was disabled. Real-life aftermarket tuners of the RS6 demonstrated that the V10 can be tuned to sub-1000 bhp levels with nary a hint of engine failure. A Godzilla killer packaged as a sleeper wagon...just plain incredible.
- Performance is ballistic. The RS6 is absurdly powerful though exhibits understeer with the stock 40:60 torque split. I adjusted the torque-split to 10:90 to improve grip and maneuverability as good as possible to compensate for the lack of a rear wing. Handling has significantly improved. However, the outer rear wheel can slip & the rear axle will step out on aggressive corner exits.
- Max torque is available as early as 1500 rpm. The RS6 requires you to be on your toes since there is gobs of power available, tempting you to take the corner faster but might result in an off-track expedition quite quickly.
- It's fun to drive the car using the throttle. At 1524 kg, the RS6 still is hefty and makes its presence known in undulating, late-apex corners. I find it necessary to feather the throttle in trickier corner sections (i.e. Nordschleife) to help the car maintain a tight racing line. Corner speed is of little consequence as the car has plenty of power to rocket out of a turn.
- The stock transmission was replaced with a close-ration 6-speeder. The stock tranny basically is a 5-speed, with 6th gear as an overdrive. Though 6th is tall, the RS6 is still accelerating (6th is engaged at approximately 181 mph). I think the original 200 mph claim is possible if given enough road, but I think the stock ratios are too tall and does not maximize car's acceleration. The close-ratio transmission is just right - brisk pace and the RS6 hits the rev-limiter at 190 mph. Until full-custom ratios are available, the close-ration transmission is the better bet.
This RKM RS6 has been delegated for Nordschleife grinding (Schwarzwald B), earning 120K per finish. Weaving around traffic, the RKM RS6 was able to post a time of 7:14.801, with no off-track excursions. Mightily impressive.
There's just nothing to fault with the RKM RS6 - the suspension works well in keeping the car planted, excellent LSD settings that efficiently transmit all the V10's power to the tires, and of course, the stupendous performance of the bi-turbo powerplant.
The RKM leviathan. Naming the car 'ikeamobile' or just a plain super-fast cruiser is a serious understatement. It has earned a spot in my 'favorites' garage because the RS6 is that good. RKM made it even better.
And can I try your cars?
Which other tunes do you use of mine?
and I know I use...the Nismo GTR LM, the Clio V6, the Evora...and the OGz Golf 
What did actually happen last night, in a bit more detail?
