Quote:
Originally Posted by 1&done
Have a question regarding the secondary cats as I cannot find my answer anywhere, figured this is would be an appropriate place to get the info. ~How restrictive are the secondary cats? I read in some e90posts that the primary are 400 cell and the secondary are 200 cell. I understand the 1M OEM DPs are less restrictive. Not sure about the mid pipe section. It matters as I am tossing around the idea of ordering some HJS 100-200 cell race cats. If the OEM cats are 200s then I will use the OEM mids (fully catlless now) Thnx
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The 1M's midpipe(& secondary cats) are different from the 135i's N54 cars. I think I saw it posted somewhere that they flow more than the 135i one.
I think it was Harold at
HP Auto HP Autosport that said it. I know the primary cats are also different - like you mentioned above, they flow more than the 135i N54 ones.
1M mid pipe w/cats... p/n 18307845669
http://www.realoem.com/bmw/enUS/part...669&series=E82
135i N54 mid pipe w/cats... p/n 18307559994
http://www.realoem.com/bmw/enUS/part...%0918307559994