My impressions: The SuperSprint and Dinan are of very similar quality. They are both great looking exhaust mods. I think the SuperSprint is a little Bolder Looking, more in your face. The Dinan is definitely more aggressive sounding. The SuperSprint is barely louder and deeper than the stock exhaust.
The Dinan exhaust sounds pretty nice. The exhaust note is very similar to the B&B one(based on the sound clip on B&B web site). I just need to convince myself it's worth $2k... hmmm... I think I can do that
While none sound like an f355 (my dream sound), the Dinan sounds the best of the bunch so far.
I've listened carefully to the Supersprint and Dinan from this video, along with the Hamann from www.bmwregistry.com, and the b&b triflos from the company site, and I've come with the conclusion that the supersprint is identical in sound to the Hamann (also aided by a tip from a friend that Hamann uses supersprint exhausts).
Next up, I need to hear the Tubis and then I will render a decision as to what I will purchase. I'm already opting for the Porsche brakes but waiting to see if Movit releases a ceramic version.
I personally prefer the Supersprint sound to the Dinan one.. If it's a little louder, it'll be very nice.. I think the Dinan one sounds a little too throaty.. and the note is not as solid as the supersprint one. But it's still a nice exhaust sound.. =)