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Old 01-25-2010, 07:48 AM
michael moore michael moore is offline
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Location: south korea
Join Date: Jan 2010
Posts: 1
Mein Auto: 1995 bmw 740il
Question Catalytic converter issues

I have a 1995 BMW 740il, american spec. I am station in south korea. I replace the converter with after market ones, plus new oxygen sensors. I assume they would be o.k. I see them on every online part store. about two month, both converters when bad. I thought maybe I had a bad brand, so I order two more of a different brand. Now they are starting to raddle and my car has lost power. This is the second time I had to replace cats less than a year. Do you have any clue on what could be causing the cats to continue to go bad? I am ordering new converter plus oxygen sensors, but not sure on where the problem really is. CAN YOU HELP?
Old 01-25-2010, 10:57 AM
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TerryY TerryY is offline
Old Fogey
Location: Woodland Washington
Join Date: Jul 2003
Posts: 678
Mein Auto: BMW '95 840
Try the Magnaflow sports cats. They are supposedly durable where the standard ones are not. I seem to remember that California "certified" ones are supposed t6o be more durable also.
Woodland Washington
'95 840Ci
'98 740i
'00 Range Rover Vitesse
Old 02-07-2010, 05:20 PM
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m5james m5james is offline
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Mein Auto: 98 740iL - Tweaked a bit
I've got Magnaflow cats on mine w/o a single issue. There installation is critical as they can't be moved too far forwards or backwards from the original locations where the stock ones were mounted or else you'll get "cat efficiency" codes.
640hp 10 X5///M, Alpine White/Sakhir Orange - Gutted cats, muffler delete, Eurocharged tune

325hp 98 740iL, black/black - Eatin 540's & $hittin 318's
PERFORMANCE:///M5 6spd swap, Iron sleeves, L/W Teflon coated pistons, 3 angle valvejob, P&P head, cams, electric fan, CF intake tube w/aluminum heatshield, Magnaflow 14816'd
Hardwired V1 above rearview, 12" RE Audio DVC sub, MTX 81000D, silver trim, 5% tint
EXTERIOR:19" Beyern Mesh staggered, Shadowline kidneys, Axxis pads

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