The very best with your search. Don't worry too much about the sound system and certainly don't let it be a deal breaker, as most of them part out theirs.
When I get mine done shortly we will see what gains mine has. Currently having my Motodyne Thermal Plenum Spacer fitted by Mopedmark. Having previously done the K&N Typhon induction and full customs stainless exhausts with Decats fitted.
That's really strange buddy, you would have surely thought by cutting a section out and re plating in would have lasted the time. Do you think they did the prep work correct before finishing ?
Been there and got the T shirt buddy too many times. Whether or not you have children or not, you come this way only once and deserve to be happy. Its easy to say to knock it on the head but sometimes it is the only option.