My was the Railtek comfort bushing too. Not sure why it gave me so much more NVH. Yes, I do have other stiffer bushings...whiteline trans craddle bushings, the rear diff inserts/bushing, whiteline steering rack, sways, AVO rear sway bracket, kartboy solid endlinks...maybe all these together had an effect. Regardless, after swiss cheesing the Railtek bushing, everything seems happier.