I messed with several CAI options on my X3 before I just went to a hollowed out stock airbox. Basically cut the bottom out of the airbox to allow more airflow, similar to what PSC required you to do for their CAI, drop-in a K+N, and called it a day. My car always felt better with that setup over a filter-on-a-stick intake or a "true" cai.
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Never run out of real estate, traction & ideas at the same time.
2007 Tacoma 2wd 4cyl 5spd reg cab - DD and support truck
2002 Kartmini w/ Rotax Jr. motor
1998 Accent L - #13 FSP SCCA Solo2 in 2005, now SOLD 
2001 Accent GS - RIP
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