Just be careful if you're sending them off that you get it in the smallest box you can (I got a bike box from Evans Cycles but they came back in a much smaller package, somehow!) as the couriers will try and rob you blind.
I found mine a bit more responsive and louder after the cats were changed - they fit 400 cell metal ones that are much higher quality than OEM, by the looks of it.
Total cost for 2 to be done would come in less than an OEM replacement for one side, and you have peace of mind if the car's a keeper. That's ignoring the not-insubstantial labour to remove 2 cats! A lambda probe is bound to strip as well....
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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