Hey I am doing a little research for a friend. He has a 2002 Boxxer the red one. He wants adjustments he would like air or putting a 2003-rebound adjustments.

Do you guys know of any companies who make this stuff or suggestions about other adjustments and mod companies? Is any of this possible wear can i get air assist.

THANK YOU


also is the black box any good is it worth the money can tell the diff