Testing The Delkevic Down Pipe On The Royal Enfield Hunter 350

The Royal Enfield Hunter 350 is an environmentally friendly little chap, but is the cat (catalytic converter) a hungry beast that's stealing away valuable performance?
We perform the same test that the air filters underwent to see if there is any performance gained in losing the cat and also did a retest of the air filter, just to double check the initial results.

There's still more to come on exhaust testing, but until then, here's a little mix-tape of different silencers.
Which sound do you prefer?