Welcome mate nice scooby 👍, you can go sports cat downpipe and pass mot or just cat back if your on a budget. Id pick a mapper and consult with them first to see what they recommend for what your trying to achieve . You have ra motorsport who are nearish to you i think i used a guy in east Kilbride for mapping Dynatune. As stuart said import car parts for oem stuff god speed brakes are ment to be good and are decent value, a breaker might be your best option for wheels n that mb developments are good. hope you enjoy the motor mate.