Hi Laedfoot, we have our own forum here on RCU called "Kyosho Inferno U.S Sports", it has all the info that you will ever need or want for the buggy.
As for sources I usually use WWW.INFERNOSONLY.com to find parts or just go to my local hobby store who has all the parts and options from KYOSHO in the shelves.
As for tuning, my buggy is a mix mash or the Inferno MP7.5 KANAI and the MP777.
First thing I beefed up was the transmition (diffs), I put in extra spider gears inside as I had moded my engine and it became a bit to powerfull, also changed the Steering servo for a FUTABA S3305 metal gear high torque, I also put in Ceremic bearings(bit expensive but worth it in the long run and they are ultra smooth and easy to clean), Titanium Tie Rods all round, magnesium nuts and bolts(hex heads) all round(very expensive but I want to save waight), KYOSHO chassis brasses from the MP777. At the moment I am on the look out for a Carbon chassis and radio plate to get rid of some more waight. I have actually done alot more to it (not that it was nessicery but I want to personalise my buggy).
Out of the box it is already a fantastic buggy well capable of winning sportsmans class races and is great for just thrashing around the track or street.
As for the price, compared to other manufacturers, it really can not be beat and there are so many versions on the market its just great.
Nothing NEEDS to be done but you now how it gets, its pay day and you want some thing exclusively yours.
Big boys and there toys.