I'm with Justin on this one. If all you care about is look and noise then by all means get whatever makes you happy. I'm all about functionality though, so I would say BMW performance for e46 IMO. although I'm not as up to date on intakes for the e46 platform as you guys.
This is the reason I don't have a CAI on the e90. Was saving penny's for the euro air box (same as BMW PE) without the fancy carbon fiber. Only CAI with proven, not skewed smoke and mirrors, gains.
On the M3 once I get to where I start messing with the engine bay, the active CAI will be the first thing to come off. Yea it sounds good, but functionally it is not doing anything for me if anything hurting me. Will probably do bimmerworlds intake.
The other thing that kills me about the aftermarket CAIs I the "heat shields". I mean come on, you don't need to have a degree in rocket science to look at those and realize they aren't stopping a lot of heat.
Edit: if I was all about looks and sound I'd get a gruppe M all the way.
Sent from my fancy city machine.