LOL!!!!! if you dont know what flex is you shouldnt be on this thread!!! you can get some pretty knarly flex outta leaves if you do it right and not too expensive! three link and 4 link flexes the best but you are loooking at alot more denero and more skills to set it up with the right geometry!!! im gonna build a trianglulated 4link with coils on the 82 and throw 4 inch marlin rears up front....... thatll flex like a champ!