Thread: N55 downpipe
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      02-26-2011, 08:50 PM   #21

MJR63's Avatar
Drives: 2011 335i X-Drive Sedan
Join Date: Sep 2010
Location: Tolland, CT

Posts: 415
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I spoke with Harold at HP Autowerks and he told me there was only a 4 HP difference from the iCarbon cattless vs. catted. I'm leading towards the catted. The catted ones are high flow and I like the idea of not having to take off my DP for service due to code issues....