Adding the K&N 33-2332 BMW filter to BMW 325i will make you feel more than pleased. The growl is great and it will remove any low down flat spots and add a little more kick! The air filter also significantly improves the fuel economy by at least 1.5L per 100km, a savings of about $3.60+ per 100km!!  It will certainly pay for itself in the not too distant future.

33-2332 Product Specifications
Height: 1.188 in (30 mm)
Outside Length: 10.5 in (267 mm)
Outside Width: 10.5 in (267 mm)
Weight: 0.92 lb (0.42 kg)

Product Box Length: 10.44 in (265 mm)
Product Box Width: 1.75 in (44 mm)
Product Box Height: 11.56 in (294 mm)

Cross Reference 33-2232 Filter
AC Delco A3613C
BMW 13717542294
BMW 13721730946
Champ Labs. AF3935
Fram CA10464
Jason JA932U5
Luber-Finer AF3935
Mann-Hummel C27114
MicroGard MGA49056
Mobil MA3935
Premium Guard PA5796
Purepro A5796
Purolator A45796
Repco RAF259
Ryco A1413
Service Champ AF5796
STP SA10464
Valvoline VA323
Warner WAF3935
Wesfil WA1006
WIX 49056
WIX WA9550

K&N 33-2332 fits the following:
2014 BMW 128I 3.0L L6 F/I - All  
2013 BMW 328I XDRIVE 3.0L L6 F/I - All  
2013 BMW 328I 3.0L L6 F/I - All  
2013 BMW 128I 3.0L L6 F/I - All
2012 BMW 330I 3.0L L6 F/I - E90/91/92/93   
2012 BMW 328I XDRIVE 3.0L L6 F/I - All         
2012 BMW 328I 3.0L L6 F/I - All         
2012 BMW 325I 3.0L L6 F/I - E90/91/92/93         
2012 BMW 128I 3.0L L6 F/I - All         
2011 BMW 330I 3.0L L6 F/I - All         
2011 BMW 328I XDRIVE 3.0L L6 F/I - All         
2011 BMW 328I 3.0L L6 F/I - All         
2011 BMW 325I 3.0L L6 F/I - All         
2011 BMW 130I 3.0L L6 F/I - All         
2011 BMW 128I 3.0L L6 F/I - All         
2010 BMW 330I 3.0L L6 F/I - w/Panel Filter         
2010 BMW 328I XDRIVE 3.0L L6 F/I - All         
2010 BMW 328I 3.0L L6 F/I - All         
2010 BMW 325I 3.0L L6 F/I - w/Panel Filter         
2010 BMW 130I 3.0L L6 F/I - w/Panel Filter         
2010 BMW 128I 3.0L L6 F/I - All         
2009 BMW 328XI 3.0L L6 F/I - All         
2009 BMW 328I XDRIVE 3.0L L6 F/I - All         
2009 BMW 328I 3.0L L6 F/I - All         
2009 BMW 128I 3.0L L6 F/I - All         
2008 BMW 328XI 3.0L L6 F/I - All         
2008 BMW 328I 3.0L L6 F/I - All         
2008 BMW 128I 3.0L L6 F/I - All         
2007 BMW 328XI 3.0L L6 F/I - All         
2007 BMW 328I 3.0L L6 F/I - All         
2006 BMW 330XI 3.0L L6 F/I - US         
2006 BMW 330I 3.0L L6 F/I - US         
2006 BMW 325XI 3.0L L6 F/I - All         
2006 BMW 325I 3.0L L6 F/I - US