I'm not an expert, but N/A engines doesn't need restrictor according rally rules, and his BMW engine is N/A. According national rules engine must be made in same factory as a car (e.g. BMW with BMW engine, Subaru with Subaru, etc.) and must be up to 3500 ccm (turbo*1.7), so M3 engine fits these rules. Yes it has more power than R5 - BMW E46 M3 S54 B35 414Hp 429Nm.
https://www.facebook.com/permalink.p...04552026438796
It's hard to tell if he's faster than last year as a drives, 2015 he won 1 rally, and retired 2 times as leader, 2014 was 3rd overall with 2wd BMW E30 M3, in 2013 was 2nd overall in Lancer EVO IX. ANd in Rally Žemaitija 2016 his braking points was much more closer to Tidemand, and Rovanpera jr. than everybody else with R5, WRC (Old generation), and proto cars.
He was untouchible in autocross, he is fast in rally stage, and now when he made quick car, and combine it with his skills, suddenly everybody start attach him for being faster than everybody else.