it really depends on the police during inspection, when they're in a good mood. you'll pass even with your engine modded. it's a case to case basis(sort of) I used to have  17s, lowered and few engine mods on my previous car before and it  passed sometimes, there are times they ask you to remove it. well a few friends of mine remove their modded things before inspection and after they pass they put it on again : )


with regards to sound competition...well we can't have noise pollution too. even a bark of dog is not allowed. i've got an 8incher sub only for already one year and upto now is still on "break-in" period.that means i can't play it loud.


if you're into sound system well i think you can have a good business since people here know nothing much about sound systems, then again, they won't buy it since they're not familiar with those things. only asians will dig it.


do you really build your own speakers?i guess you're a genius, i can't even compute to build my own box.haha. gears here are mostly sony, pioneer jbl. though there are shops who sell DLS,JL,soundstream kicker and focal. i've got cadence and RE audio for my car and i ordered them thru ebay,i know it's not within your "taste" but hey, it's for everyday driving only : )