Do these clamps come with the bolt and hardware?

Yes—each clamp ships complete with its tightening bolt ready to use. No additional fasteners needed.

Will stainless steel clamps work on a stock exhaust?

Absolutely. They work on any 2.75" diameter pipe—OEM or aftermarket. Stainless won't corrode or stain like mild steel, so they'll look clean longer.

How tight should I clamp these?

Tighten until the band sits snug against both pipes with no gap. Don't over-torque—you're sealing the joint, not crushing the pipe. Hand-tight plus a quarter turn is usually the right feel.