slater - The BMW performance exhaust is OK. I would describe it as just a touch louder than the factory ZHP exhaust. It has a really nice look with the adjustable tips filling up the opening in the valence perfectly.
If you really want exhaust feedback (louder) I would recommend a Stromung or UUC Corsa.
The intake really shines - you don't get the loud guttural noise like a lot of the open element kits, just a sweet note when you get into the rev's.
I was lucky enough to get my Performance exhaust and intake on a super clearance sale (more than 60% off) which made it an easy choice.
MJ