1) No. It can also be used in a 3-cyl QQ or Kelisa or V6 Cefiro.
Of course only in-line 4 lah! 
or V8 i suppose
2)Not sure.
3)Doesnt look like there's any filter anywhere. So i guess anything
can fly inside... leaves, bees, snake etc....
4)Screwed up.
5) Screwed up as well.
6) Ya it might be illegal, cos they'll say your car too loud... not
cuz the exhaust, but your engine
basically for this mod, i believe you'll also need to tune your
fuel and air sensor thingy... or else your engine won't run
properly.
