I've only got the K&N drop-in, so I cannot answer that one. Someone else can.
U-Bend Delete is where you remove a pipe that takes an unneccessary route around some (steering?) components on the underbody. That helps remove some restriction, helping move the exhaust gasses faster and easier.
Welcome to the board.
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WizAire CAI w/9" K&N & HV3, 2.5" d/p w/h/f cat, Cobra CB, PowerSlot slots w/Hawk HPS, GR-2s, GMPP handling kit, NextLevel STBs, Pilot Sport A/S Plus tires.
98 L36/MM5
RaC