Col cos1,
YES I have a scorpion on at the mo, I threw away a 3 month old mongoose that the car had when I bought it, as punishment for giving me a three month headache!!
I also had the car on the rolelrs before the scorp was fitted, and after, not because of any problems just a check.
The low end torque improved noticeably with the scorp, but little on the rollers.
My experience of different exhausts is this,
Scorpion nice and quiet on the inside, and nice noise outside.
Magnex F*****G noisy on the inside too quiet outside.
Mongoose, way too bloody loud all the time inside/outside and crap noise, though others like it.
I couldn't say there was any noticeable quality difference between these three, they were all excellent first class quality, and well worth buying the one YOU want.
tabetha
ps the reason why I threw away,(after chopping up) the mongoose was the piss take prices some were offering for it second hand ranging from £30-£70, that's with me posting it as well.