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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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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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Old 10-31-2014, 07:57 AM   #6
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they actually sell the kit on ebay with cats and all...without the extended wiring...

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Old 11-09-2014, 12:55 AM   #7
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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!
I would like to know also
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Old 11-09-2014, 08:51 PM   #8
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Quote:
Originally Posted by dragondrpr View Post
they actually sell the kit on ebay with cats and all...without the extended wiring...

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didn't know that.. is the kit XI specific?
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Originally Posted by dragondrpr View Post
I would like to know also
Headers add an easy 15hp. Massive butt dyno difference
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Old 11-13-2014, 04:05 PM   #9
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http://www.ebay.com/itm/STAINLESS-HE...5c0302&vxp=mtr
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Old 11-13-2014, 04:30 PM   #10
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What kind of cats and how much?
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Old 12-02-2014, 10:02 AM   #11
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So do these include the Cat's? Anyone have experience installing these? Pass emissions testing?

My 330XI has an exhaust leak and sounds like a tank. Need new headers but also have strict emissions testing here in PA.
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Old 12-02-2014, 02:18 PM   #12
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So do these include the Cat's? Anyone have experience installing these? Pass emissions testing?

My 330XI has an exhaust leak and sounds like a tank. Need new headers but also have strict emissions testing here in PA.
Someone stated that they bought those off Ebay within the last week, search & you'll find it. Then just wait to see what they think of them & if they fit reasonably well the first time once installed.

EDIT: I believe it was "dragondrpr", if he doesn't see this & respond just send him a PM & ask.

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Old 12-15-2014, 04:15 AM   #13
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Sorry didnt pull trigger yet
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Old 03-13-2015, 08:11 PM   #14
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redbull, were you able to pass emissions?
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Old 03-17-2015, 08:20 PM   #15
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redbull, were you able to pass emissions?
yup, it set readiness.. but I think the cats failed within a year



since when does SC care about emissions?
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Old 03-18-2015, 10:45 PM   #16
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What puzzles me is the in-line cats you installed seem to be similar size compared to the factory babies. They should work without the O2 90's. Maybe inefficient and why they fried? Doh!
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Old 03-19-2015, 07:19 PM   #17
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the oe units were much heavier duty than the sport cats
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Old 04-25-2015, 01:02 AM   #18
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Finally installed those ebay headers ....it want smoothly 3 hours but after hours and hours of research. Only thing that was in the way that wasnt covered in any read was a plate attached onto mount bracket that I had to knock off ....thanks again fanatics and thanks to Cobo on s . Broadway yonkers....for letting me rock the lift and the tools...
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Old 04-25-2015, 04:17 PM   #19
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Finally installed those ebay headers ....it want smoothly 3 hours but after hours and hours of research. Only thing that was in the way that wasnt covered in any read was a plate attached onto mount bracket that I had to knock off ....thanks again fanatics and thanks to Cobo on s . Broadway yonkers....for letting me rock the lift and the tools...
Now buy yourself a Shark Injector & either a drop in K&N or a Cosmo Racing CAI and you'll be VERY HAPPY. These 3 working together feel really good on an E46 for N/A power.


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Old 04-28-2015, 10:58 PM   #20
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Now buy yourself a Shark Injector & either a drop in K&N or a Cosmo Racing CAI and you'll be VERY HAPPY. These 3 working together feel really good on an E46 for N/A power.


Rob43
hey whats up .....i have a CAI, custom exhaust now header and a tune from ziptune.com (sick) prepared for all the add on plus its ready for valtronic exhaust i plan on doing ...lol.....im planning on getting it on the dyno....i let daniel_f. see the tune file ...he was very impressed....i was already a fan of this car.....now i feel like a little kid with a new toy .....thanks for all the help ROB, the information you share really helps ....keep it up......i know i should have taken pictures of the work but it was just to messy i dont use gloves lol ill take shots of the headers in the morning

anyone need pointers on xi install hit me up ......for now dont forget to install the 02 before installing headers, on my mount bracket there was a piece of steel i had to knock off ....wont fit unless you remove it...and i had to remove 2 firewall pieces for better clearance
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