South African tuner RGMotorsport has released details of its new stage four package for the Audi RS3 Sportback, giving Ingolstadt’s all-wheel-drive hot hatch yet more grunt.

The Randburg-based firm claims to have hiked the turbocharged 2,5-litre five-cylinder’s peak outputs from the stock 294 kW and 480 N.m to a stonking 361 kW and 591 N.m.

The package includes a 101-to-76 mm decat downpipe, a 76 mm RGM-Techniflow stainless steel exhaust system, an RGM hybrid turbo upgrade to the existing turbocharger, a high-flow intercooler, an RGM-Goliath cold air intake and even a water-meth injection kit, along with the requisite software tune and an on-the-fly dual-map switch (the second map seemingly set up for use with an octane booster).

The result? Well, RGM says it recorded a 3,6-second sprint from standstill to 100 km/h on its VBOX data logger, which is half-a-second quicker than Audi’s claimed time. The tuner furthermore says its modified Audi RS3 Sportback managed a quarter-mile time of 11,7 seconds at a terminal speed of 195,2 km/h.

Listen to the RGM-tuned RS3 Sportback clear its throat in the clip below...