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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 11-22-2012, 11:36 PM   #21
redbull 325is
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Just out of curiousity, what's the point of this other than to be green? Why didn't you just keep the stock cats? Are there benefits of having headers and cats vs the stock ones?
Removing the stock cats and replacing them with headers on 325/330 yields ~15-20hp and a glorious exhaust note. By adding these sport cats i've maybe lost 3 hp, ie not noticeable at all, the car sets readiness/no CEL and you loose the funky "no cats" smell. I have also messed with o2 sims and did not get good results. In terms of bang for the buck, i highly recommended it.
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Last edited by redbull 325is; 11-22-2012 at 11:36 PM.
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Old 11-24-2012, 04:32 PM   #22
SamDoe1
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^ Cool! How much and where did you get them? Apologize if you already wrote this in the thread.
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Old 11-24-2012, 05:27 PM   #23
redbull 325is
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^ Cool! How much and where did you get them? Apologize if you already wrote this in the thread.
headers are $100 ebay knock-offs, cats are generic, you can get them off ebay/amazon
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