decat

I am selling my 2006 Black Sapphire Metallic exterior on Black interior M5 w/ 66,000 miles for $28,500. This car has never been in an accident and qualifies for both Carfax and Autocheck buyback programs. Troy Jeup just installed a new engine ($10,000), new clutch ($2,500) and rebuilt the SMG...

Guys, After researching a fair bit and finding little to no info re the cats, i decided to give it a go and see what happens. My reasons as follows: 1. Complete decat was out of the question for many reasons. 2. Yes the 3.6 m5 ceramic cats are rock solid however after 20 years, like...