Greg, all chassis will bend, we found the Knack chassis stronger than either of the two Mugen chassis. Mainly because it's stronger between the engine and rear bulkhead supports, it has a slightly larger profile making it a little stiffer with only 3gr weight penalty. This is the second Knack chassis we have used with the first only changed because we were running in the Nationals not because it was bent. I would recommend this chassis as an excellent option to either of the Mugen chassis.