I just got done installing the old tamiya suspension on this car. Everything feels alot better and I'll test it out on the track tomorrow. One thing I would like to point out is that the front suspension mounts are closer to eachother for the new suspension arms. This offsets the arms foreward so that the wheelbase is lengthened about 5mm. I had to trim off about 4mm off of the rear of the front suspension arms in order to move them back to a reasonable posistion. This is my first tamiya car and with the old suspension definitely has alot less slop and feels alot more rigid. The reason why I made this suspension change is because every 415 driver who purchased the new suspension said it sucked and they ended up using the old suspension anyway. It also easily tweaked alot due to the long steering linkages.