Take a Deep Breath

Update by Joe Gearin to the BMW M3 project car
Mar 11, 2009

After years of hard use, our old filter gave up the ghost.
K&N's X Stream design improves flow with an open-top design.
Installation was as easy as a DIY project gets, and now the M3 has a permanent filter.

A few years ago, we installed a secondhand cold-air intake that had seen who knows how many miles in its past life. Recently, we noticed that the ITG filter that came with the kit had degraded badly and was in need of replacement.

Although the ITG filter had served us—and the previous owner—well, we decided to try K&N’s new X Stream line of universal filters. The open-top design lets more airflow in, and is claimed to increase service life as well.

As we’ve come to expect from K&N products, this filter is well built and installation was a breeze. We haven’t noticed any seat-of-the-pants difference between the two filters, but we didn’t really expect any. As with all K&N filters, the X Stream series never needs replacement, just occasional cleaning.

Our X Stream filter retails for about $66.00, although you may be able to find it for less from one of K&N’s retailers.

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View comments on the GRM forums
turboswede UltimaDork
3/12/09 1:26 p.m.

Is that intake pipe dented on the top?

Joe Gearin
Joe Gearin Associate Publisher
3/12/09 1:50 p.m.

Nah, it isn't dented. The lighting hit the carbon fiber in a weird way, making it look dented.

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