Best pipe with out packing

[nicktrx400ex]

i want a good exhaust but i dont want to mess with packing can any one help me

[underpowered]

every exhaust has packing. it not like a chambered car exhaust. all quad mufflets that i know of use packing. However, HMF uses silent sport packing and says it will not need to be repacked for 5 years.