Hi,the exhaust is personal taste if you want loud go for yozzasport if nice grunt and good quality go for milltek thats the one i,m looking at. look on you tube for demos.
as far as induction kit is concerned there are many that say alot of them cause a power loss....i have got a itg panel filter in the original box that people on here approve of...or if you have big bucks to burn the maxogen induction kit is there but ova £300
the suspension on the cup is as good as you will get i think unless you get a trophy.