The DRZ's are good bikes i rode one for motorcycle school a few years ago, i race dirtbikes so it was very similar to one thats why i like it somuch...putting those mods on the bike will help yes and make it sound way SWEET...but i never owned a DRZ, ive always had KTM and you being at 5,500...you have a long way to go till a rebuild unless you dont take care of it, throw some upgrades on it every once in a while and maintain it! mainly change that oil often for me i change it every 5 rides, its simple and takes no time on those sport bikes... it should last you a long time tho