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My 1st cat rattled like no other, forcing it's replacement. The 2nd cat did not rattle at all and was probably replaced within a few months after the 1st. It was simply clogged up so badly that nothing would flow, so removing the 02 sensor gave it that little bit of flow I needed to be able to get the car driveable enough to a shop for replacement.
I was under the belief that a failed cat would always rattle, but that simply wasn't the case for me. Removing the precat 02's, one a time and driving around, then seeing if the power returns will just be another way to see if either of Simon's cats are clogged and failed in the same fashion that mine were.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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