I used a standard exhaust clamp on mine.... holds well... i snapped the band clamp due to rust and age... but maybe some heavy duty thread lock on the threads? or maybe a new clamp altogether would help...
2004 YELLOW TRX400EX
15/39 Sprockets, 2005 Lower End, 22X11x9 GBC X-Rex,
23X8X10 Interco Swamp Lites, 250X Clutch Cable,
Aftermarket Swingarm Skid Plate,
DG Headlight Guard, Moose Racing/DynoJet Jet Kit,
Moose Racing Bars, Moose Racing Aluminum Hand Guards,
Moose Racing Comp Handguard Protectors, UNI Air Filter,
Moose Racing Muffler Packing, Pro Armor Tether Kill Switch,
Sintered Brake Pads, Team Alba Pro Elite Nerf Bars,
White Brothers R4 Slip on, White Bros Air Box Vents,