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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 03-27-2013, 12:11 PM   #1
redbull 325is
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DIY XI and ebay header & sport catalytic convertor thread

Thought I had posted this all in one place previously but I hadn't.

Will ebay generic headers fit an XI? How can I pass odb2 readiness for inspection? Read on:

Yes they fit just like rwd cars, ie poorly
-The rear o2 bungs usually hit the body of the car, or each other and must be shaved down to fit,
-They usually don't line up too well with the remaining exhaust, so you'll need to forcefully help them out a bit
-The gaskets they provide that go between the headers and the remained of the exhaust usually blow out within 1-2k miles, get some OEM BMW replacements.

To install them you do have to drop the front subframe down a few inches, however axles can stay in place. Secondary air pump should also be moved out of the way.

in terms of putting aftermarket cats on an xi 2 inch small bullet style cats fit nicely where the first resonator is. Since they are soo small and space is cramped you'll need to run 90 degree oxygen sensor spacers to trick the car into thinking the car is running bigger cats and to allow the o2 sensor to fit properly. I had previously tried the o2 sensor simulator but it always ended up throwing a lean fault on deceleration.

Then extend your rear oxygen sensor wiring harness

picked up decent copper trailer wiring as it already has 4 wires together and would make life a little easier:

finished product

car set readiness and has been working fine for a few months now.
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Last edited by redbull 325is; 03-27-2013 at 12:20 PM.
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Old 03-27-2013, 12:40 PM   #2
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Bump for all xi people
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Old 10-28-2014, 04:15 PM   #3
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Old 10-28-2014, 06:42 PM   #4
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Sweet. Need this kind of treatment on my car
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Old 10-28-2014, 08:53 PM   #5
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Well done, now this thread will prevent gazillions of Ebay XI header posts. I'm feelin' a sticky may be here?

How does she sound and was there any butt-dyno difference? Lot of work, I want to hear about the pay off!
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