There are a lot of parts available that are compatible, everything you mentioned is as if you would be seriously into tuning your n/a. It all depends on what you want, that question cant be answered for you so surely you should have some individual ideas on the direction of your car and what you would be realistically going ahead with? Some things such as lsd would be a waste of time for us, you wont be struggling for traction on the ickle 4e. Altho the other stuff u mentioned such as RRFPR, leads and sparks would defintely work. Backboxes can defo be sourced and full exhaust systems too, i