I don't recommend high-flow cats IF you live in an area that runs emission test. My high flows threw a P0420 code immediately.

If no emission tests in your area, then I recommend the shortest-nothing-inside-them cats you can find OR just cut open your cats, gut them & weld them back up (hollow)....my 2-cents.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"