Hmmm.. will those things help alot do you think?

I have an old LRP F1 bullet, it'd pretty huge. I want to get a smaller one but I'm not sure what to get.

Will the plastic outdrives break easily? They'd probably make the car a bit faster huh? Because they make the drivetrain lighter? Is that the same with the ball diffs? They sound expensive, if I buy them one at a time, should I put it in the front first or the rear?

I don't think I'll bother with that body suggestion, unless you think it's going to help dramatically.

Thanks for all that help, any more tips?

-Pat