Audi 90 quattro 20v suspension

[xxErix]

Hello 

I have just bough these BC racing coilovers, due to my friend saying they should fit, but I though I would double check in here. (see the link) https://www.rhdperformance.co.uk/bc-racing-coilovers-br-type-rn-for-audi-s2-coupe-awd-90-95-35810-p.asp

also, I was thinking to change the air box, to cold air ( exposed cone filter) is there any benefit to it? 

Audi 90 b3 20v quattro 1990