I have the Specialty Spares Exhaust system on my Thrux (the bike in the picture for the Thruxton pipes at the Specialty Spares site is actually my bike!).
They are nice and rumbly at idle, and they scream at speed. I cruise around in town at around 3500 to 4500 RPM, and I cause a lot of ruckus with these pipes doing so. They are loud, but not ear splitting loud (keep in mind, that to me, loud to me is a Harley running straight small diameter drag pipes) "Seat of the pants" dyno also feels like she revs a lot faster, and I have picked up some low end pop (I get to the ton quicker). I did remove the AIS though due to popping during decel. I did not have to re-jet either, just 3 turns out on the PMS screws and everything was tight (Started running cooler as well).
Quality is ok (considering it is only $169.00 for the cans), fit required a little "aligning" that you would not have to deal with if you were installing D&D's, etc (there is a adaptor that comes with the kit, so you have to align at 3 places instead of 2 with D&D's Predators, etc.). Finish is good, but not top notch.
I posted a video a while back, but I have since taken it offline (if you want it, email me - it is big). Here is a link to Jespo's website with some pics and a video on page 2:
Specialty Spares Thruxton Cans
[ This message was edited by: asphyx9 on 2005-09-20 09:53 ]