:hmmm:Err, should that not be B4 coupe has B3 coupe wings not the other way round, B3 coupe wings were always different as B3 coupes were fitted with 15 inch wheels with 60 profile tires on introduction in 1988, B3 saloons on intro in 1986 had 14 inch wheels or optional 15 (standard on 20v with 50 profile tires) B4 saloons needed modified wings as they came with the 15 inch wheels on introduction.

Defo 3 types of wing on B3/4 UK supplied cars not including different markets where some came with no side repeters.

Any pictures?

Engine wise, is yours the early 7A with the bag of snakes exhaust or the later one with cast manifold?
If its the later car the bag of snakes exhaust is more efficient and can give upto an extra 7bhp depending on engine condition. There are only two main issues with the 7A.
1) Distributer gear was plastic in a lot of cases. So good idea to check and if necessary replace it for the brass version before it breaks.
2) Injectors are a poor Hitachi design single point injector. Fitting the Bosch upgraded multipoint injectors improves efficiency and therefore mpg and can give upto an extra 10bhp.
https://store.034motorsport.com/audi...-improved.html
There are other upgrades but it starts to get expensive. And change oil every 8-10K. Oh and should use super unleaded in it for best results, especially since the new E10 came out..