If you change to bigger rims, it will make it more bumpy as the tyres are lower profile and rims are heavier than stock, hence more unsprung (yes, we call it unsprung) weight.

Lowering by changing to lowered springs, but isn't Avanza using leaf springs at the rear?

I dont know if there are aftermarket shocks for Avanza or any MPV. Changing shocks will effect better comfort ride or better handling.

This post has been edited by SleeplessEyes: Jun 14 2009, 01:33 PM