Buddy Club Spec IV on an ek9 is poss the best sounding exhaust on any car i have ever heard. It is close to the Spoon N1 but the spec 4 just has it, it doesnt suffer with the booming like the spoon and has a real nice rasp to it at 8k + rpm.
Trust me i have had a go with them all. There is a mate of mine with one poss looking to change it soon if you are interested
Dunx