Quote:
Originally Posted by BM2W
Dinan used to offer a CAI for the X3 (I have one on my '04 3.0), it picks up cold air from behind the headlights and off the left side brake cooling duct. I aalso have the free-flow muffler and upgraded engine software. It makes a noticeable, though not dramatic (113 HP, 11 ft#), improvement in throttle response. My mpg went up a little, too.
AFE makes decent stuff, popular with a lot of modders, worth a look.
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AFE products are definitely popular. There are quite a few X5 owners who use them, cheaper than the Dinan CAI and same close if not the same numbers of improvement.