I have recently installed a new set of muffler bearings on my truck and i have picked up another 50 hp on the dyno... well worth the money .. and the mechanic at the shop says that all u people with the forced induction should be getting the new meth cooled muffler bearings.. And WOW they make this engine sound sweet.. ohh and aprently the meth cooled ones are jsut the cats pajamas.. ... they were only $2400 us...