I think some poly or solid suspension bushings will not affect the ride comfort much. I wanna say the damper/spring relationship is the key to ride comfort. I might notice some more feel transmitted through the steering wheel with poly bushings. The squeaks might driving you crazy.
Driveline bushings will transmit a lot more NVH.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
Last edited by bigjae1976; 08-16-2012 at 02:12 PM.