I have Tein's as well and unless the roads are smooth, you're gonna have horrible ride comfort. ESPECIALLY if you lower it too much and don't have other mods in place to compensate for the change in...
more info: mine seems to be happening at start up and again everytime i'm coming out of a corner at about 2000-3000rpm. as it approaches or hovers at 3000, the buzzing sound is very apparent.
quite a lot of difference now that the shock absorbers are actually working. and a bit more comfortable now for the daily drive because i'm not all over the place and the tyres are making more...
hahaha. that's true. hence i said at least 500km per tank on average. i hardly ever hit the fuel empty light, it usually hits 500km's first. and 50L might be +/- a couple of litres.