The system does comes with a set of clamps, but the product descriptions do state that it is a weld on setup. Redline360 even delayed my shipment in order to confirm that I knew these were specifically weld on.
Either way, I would recommend you have them welded. You can guarantee that they will never come loose or leak. I've done one cat-back system in the past that used clamps (as opposed to flange-tip), and the damn thing completely fell off once and it was notorious for coming loose, causing the tips to move. I ended up welding it; thus, solving the problem.
It's cheap insurance that the system will stay on and stay aligned properly.
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