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If your not getting a CEL i wouldn't worry about it for now. I changed mine and didn't notice any difference I got the OEM Bosch and the pre cat is about 72 bucks I think? Post was 90 or the other way around, but whatever its not cheap. You can do this yourself its not hard at all, just spray the area with PVC blaster to loosen where the sensors screw on and then you can remove easier!
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2003 BMW E53 X5 4.4i - M62 engine (Non Sport with Premium and Cold Weather Package)
Color: Steel Gray Metallic
Mods:4.6is Exhaust (Pipes, Mufflers and chrome oval tips) BMW Sport package Taillamps, BMW Tire Valve Stem Caps
Medium tinted front windows
JVC HD Radio
Alpine 4x100 channel Amp
Orion 600W Mono HC Amp
Three 12" Sony Xplode in subwoofer enclosure
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