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  1. E30 E36 E46 E90 E92 E93 M3 Discussions
    So deleting the cats & air pumps an adding headers with pre cat O2 sensor with a new full exhaust. So Can I just tap the exhaust pipe and thread the post O2 sensor in the new exhaust pipe without any cats??? Maybe use spark plug non fouler. I see others doing tunes an using simulator but why...
  2. E39 M5 and E52 Z8 Discussion
    Hey all, I took my M5 in to get it thoroughly inspected at the BMW dealership for upcoming maintenance and repairs, since I couldn't find a shop that had earlier appointments available. The BMW tech, who's a Level 1 Master Tech since 2001 and an E46 M3 owner if that matters any, said the cats...
  3. E60 M5 and E61 M5 Touring Discussion
    Today I noticed a noise below my ionic module and my understanding is that is where the vanos solenoids are located. So i tested my vanos through ISTA and and they weren't in the red but they where barely in the green. I also believe that there is a solenoid for intake and exhaust and my thought...
  4. E39 M5 and E52 Z8 Discussion
    Just installed Supersprint manifolds and sport cats on 01 e39 M5. Initially SES light came on and several fault codes were generated. After two test drives, the SES light has not returned, but two fault codes have: Catalytic converter conversion bank 1 and bank 2. The vehicle is essentially...
  5. Parts / Other For Sale or Wanted
    I need stock downpipes downpipes for my m6. I believe the m5 downpipes are identical. Please message me if you have them. Need them soon. Thanks! Text or PM 8184547167 Robert
  6. Parts / Other For Sale or Wanted
    Looking for a pair of catalytic converters for my e39 M5 or equivalent aftermarket options. Let me know your price shipped to 60025. Thanks!
  7. Exhaust Discussion, For Sale, or Wanted
    Special price & free delivery for Turbo downpipe kit Right & Left (Replaces catalytic converter) BRONDEX for BMW 5 Series F10 M5 V8 2012- is entirely made of high-quality stainless steel by the means of the welding by TIG technique in argon medium. • Diameter 89mm., wall thickness 2mm; •...
  8. Parts / Other For Sale or Wanted
    im selling my factory m6 v10 exhaust manifolds that have that cats built into them, i recently got the evosport headers installed and not thinking ill ever return to stock. i know these things are worth a mint but looking to get $700 shipped. Email me at [email protected] or text or...
  9. E60 M5 and E61 M5 Touring Discussion
    Good evening Need suggestions and feedback. How primary cats removal will affect the engine and to the exhaust system. Please explain how specialist put back sensor, so the computer won't show engine check light. Thanks in advance
  10. E60 M5 and E61 M5 Touring Discussion
    Ok.... Very frustrating Day at the dealership. My car a 2006 with 65k. I first want to say thank you to Eloy for setting the service guy right at Bill Jacobs in naperville. Here is what happened.. My car had a rough Idle, the slow rpm up and down, it started a week ago and came and went...
  11. E60 M5 and E61 M5 Touring Discussion
    I really hope any of you can help me now. Have had this problem to battle with in the past months now. Problem is that the faulty codes "catalytic converter bank 1 & 2" comes up. As previous read and discussed in threads here I have changed the lambda/CO2 sensors and the temperature sensors for...
  12. E34 M5 Discussion
    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...
  13. Parts / Other For Sale or Wanted
    Anyone upgraded their cats and have the OE cats laying around that they can sell?
1-13 of 13 Results