fyi:
On my green 94 which I supplied the Dynomax 24222 Racing Only mufflers, the shop ran 3" aluminized pipe from collectors to the mufflers and then put dumps off the mufflers = $114
On my tow rig, 92 C2500, I supplied the mufflers, shop ran 2 1/2" aluminized pipe from exhaust manifolds to mufflers and then put dumps off the mufflers = $80
Depends on size & type of pipe..........I've always shopped around and have ALWAYS found Maxi Muffler to be the MOST EXPENSIVE!
Before those above, I had a 04 F150 XLT Heritage Edition Supercab, I had the shop install a Flowmaster 40 series that was single in - dual outlet, made tailpipes, and installed chrome tips of my choosin = $214