This is Mario Jurisic´s Audi A4 STW, driven by his 20 year old son Matija, a real ex-Works chassis and one of the last Audi A4 Touring Cars still competing on Europe. With almost 300Hp/8.750Rpm from its 2.0L Naturally Aspirated engine (based on the ABF block) moving only 980Kg. Here it can be seen attacking Skradin hillclimb during the last Bongo Hillclimb Monsters where it placed among the 10 Fastest Monsters of the event.
This is Chassis SF37, built on 1998 by Audi Sport originally as a FWD Touring Car machine for Christian Abt, but was later converted into a 4wd Quattro machine in 1999 (with a certain Mattias Ekstrom driving it that season...).
Through the years it belonged to Kristoffersson Motorsport and used in the Swedish Championship, raced later on Serbian Hillclimbing by Goran Asanovic, and most famously spending an incredibly successful period period being run in the Spanish Hillclimb Championship by José Antonio López-Fombona, being at the time one of the most successful duos in all of Spanish Hillclimbing. Shortly acquired by Greek hillclimb team Cabilis Performance, it would later be purchased by Keith Butcher and run in the 2017 HSCC Super Touring Car Challenge, finally being sold to Mr. Jurišić at the end of 2017.