Clamp them... that's how they're designed to be installed. I would, however use a stainless steel band clamp similar to this one pictured (only you don't need for it to be a reducer). They tend not to crimp the pipe so it actually CAN be disassembled in the future.
(I found the image here: http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=191816&prmenbr=361 )
Jeff Pierce
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Jeff Pierce
Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F
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