Evening Joolz... I have a high level titanium "Austin racing " exhaust on the ktm390. Very, very loud but it has improved the bike quite a lot. Certainly as far as tractability is concerned, they claim a three bhp improvement but that isn't why I bought it. I bought it because it was just a bit different to the run of the mill "end cans" but like I say vast improvement over the standard system..cheers, Michael