im looking to buy a exhaust for my 2003 katana air it has 70cc mallosi bore kit 19mm mallosi carb mallossi carbon reeds polini race variator with 7.0g mallosi rollers polini 2g race clutch dobbler air filter but the 2 exhausts im debating over are a scorpion or a polini derazed 1 but there for a year 2000 model katana liquid cooled would any of them be good or should i just stick with my arrow exhaust i got off a sr50 deitech even tho it runs shit
