Looking into one of these and ive seen 2 people who make them, PA and BMR, are there any others? Also besides weight do they improve handling and are there any other advantages? Also is 4-500 about the cheapest you can get them, saw them on thunder racing and have been thinking about it for a long time, just curious if htere is anywhere that sells them cheaper.

 

As far I know BMR and PA are the only ones. I am considering the BMR for my 383 project. There is a Group Purchase starting up on the BMR and possibly the PA too. Check out the Group Purchase section.