The standard springs (non asymmetrical) would certainly benefit from anti-tramp rods on a powerful car. The new Suplex asymmetrical springs are much more resistant to tramp but I can't comment as to whether or not a powerful car, such as the 270hp Roadster, fitted with the asymmetrical springs would benefit from the fitting of an anti-tramp rod. It probably depends on driving style.
I recently road dyno My +8 Bitsa 3.5. Maybe 160HP at the flywheel. Not much more. I removed PM's tramp rods because they were not needed. I think others are going for the 4 leaf for ride comfort. I think I would rather spend this money on a "coil over". However; it will not be Suplex. Local Hot Rod shop will make one (trailing arm) for much less money than Suplex. Now will it be better? Hard to say, but the one I drove was pretty nice.
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