The intake pictured is for M50/M52/S50/S52 cylinder heads. You can make the manifold work with an adapter plate though. Can't comment on the quality of that manifold...

 

Oh ok, I noticed it had m54 in the title.

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I wouldn't trust that. And even if the build quality wasn't half-bad, I doubt you'd see any power gains. Plus, that's gonna look ghetto as hell in your engine bay.

Save the $350 for a Shark Injector if you don't already have one, or power pulleys or exhaust headers. You'll get more out of those mods power-wise.

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I already have bimmer brakes headers and a shark, and just picked up a set of cams to have reground, that's why I'm looking at the intake next.

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Nice, did you go with the Schrick 264/248 cams? If you've got the 2.5L you could of course upgrade to the 3.0L intake manifold, but I'm assuming you have a 330.

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I'm getting stock cams reground, I'm debating about whether to go with Elgin cams, schneider, or riot racing. It's a 330ci, so I've already got the b30 intake.

Already going this far, with headers, shark, and cams, that's why I'm looking at an intake. I found this one on ebay, and it looks like high flow. I hate to say it, but the itb look looks cool too.

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A member with the username gurov has it in his car. Here's the link to his thread (found with a quick search):

http://forum.e46fanatics.com/showthread.php?t=773653&page=15

You don't really need an adapter plate to physically make it fit. You just need to remove one of the center studs on the intake side of the head. To make it transition from oval to the d-shaped ports, then yes either adapter or port the head. Which again by searching you can find has been done in the "m50 intake manifold conversion" thread.

As for it looking "ghetto" I think it looks fine. But I'm not sure on advantages (if any) in a non boosted application. The pics below are from gurov's car. Hopefully he's cool with the images in here.

 

I figured with cams and headers it might be better on the top end

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Maybe, but you're going to lose a lot down low and in the midrange.

 

Meh, it's a 6 speed, it's not like it's a torque monster anyway, gotta spin it up to move it fast...

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