I don't think my Nur Spec is particualrly noisy. But the screamer pipe is, well, just screaming! I have only used my ears as a test but I reckon the screamer pipe adds at least twice as much noise.
Wez, what are the costs of a center silencer? did this account for any performance loss? What was required to plumb the external back in? Was it just fabrication or is there somethig off the shelf?
I ask this because I love the sound when I have the road to myself, but it is a tad embarrassing when overtaking as when it kicks in you can see the other drivers noticeably flinch because of the auditory attack... so many questions