Have been searching around for A/C units for my Sporty..

Anyone have experience with any of these?

4" UNI Chopper Daves (hand cast aluminium.. the man is an artist. Needs bracket/head vent)

4" K&N Joker Machine (fully intergrated, no extra brackets needed, vents back into itself)

5 1/4" K&N Still Kicking (needs bracket/head vent .. the finned one is EXPENSIVE)