MTM's massive 15-inch cross-drilled vented floating rotors and enormous eight-pot calipers replace the 14.2-inch Audi front brakes, while 12.6-inch rotors with four-pot calipers replace the factory 12.3-inch rear discs and provide balanced retardation. MTM Bimoto alloys (9.5x19 with 265/30 Michelin Pilot Sport Cup tires), using spacers to achieve the correct offset, create both a slightly wider track and significantly more mechanical grip.With the 40/60 torque split dialed into the RS4's Quattro-equipped chassis and the sticky tires clinging to the tarmac, it is easy to believe this car will never run out of grip, at least on a dry road. It may not hang out like an M3, but with so much power and torque, regaining speed after slowing for a bend is easy. And since the experience of accelerating is so much fun, you can sometimes find yourself slowing down just to accelerate again for the sheer hell of it.
In the early '80s, when the only superchargers used by European tuners were heavy, inefficient and noisy Roots-type units, a blower conversion was a compromise. Now superchargers are lighter, more efficient, noise-free and, thanks to advanced electronics, seamless in the way they integrate with other systems. MTM's K540 conversion is so good, it's difficult to tell while driving normally (apart from the rorty exhaust) whetheranything has been done to the engine. But once the open road beckons, it's a whole other story.
MTM Audi RS4 K540
Longitudinal front engine, all-wheel drive
4.2-liter V8, dohc, four valves per cylinder, MTM intercooled supercharger system, sport exhaust
MTM racing coilovers with remote damper reservoirs
MTM eight-piston calipers and 15-inch rotors (f), four-piston calipers and 12.6-inch rotors (r)
Wheels And Tires
MTM Bimoto, 9.5x19
Michelin Pilot Sport Cup, 265/30
Vented carbon fiber hood
Peak Power: 540 bhp @ 8220 rpm
Peak Torque: 413 lb-ft @ 3700 rpm
0-62 mph: 3.9 sec.
Top Speed: 199 mph