I had the t6s i liked them better than my friends t5s, as for the lrds i dont have any personal experience with them but my friend has them they seem to be ok just not as good of quality as others, i dont care for the look of the lrds myself.
any quality 10w-30 will work just fine, i used 20w-50 in my last change and it works just fine also, what ever you get make sure you DONT use synthetic.
unhook the little black box on the front left side of your gas tank and the connectors on the tors. if that doesnt work you need to unhook your ebrake follow the connector down by the radiator and unhook it there.
as far as dirtwheels is concerned the banshee is old news that is why they quit putting it in the tests, they have new stuff to try why would they waste time on the old. alteast IMO that is the way they are thinking.
I bought 190's and the weight is not a issue and i could use the rims for something else if i wanted to, i you dont jump to big 125's would be fine. for what little bit of extra money it cost i would by the thicker ones anyway. good choice for tires i have almost the samething except mine arent extremes
I would try the jetting where it is at first if you buy them, you will probably have to rejet, i personally like the t6's better they are more of a topend pipe, fmfs are more of a mid range pipe.