You probably shouldn't have leased the car if you wanted to mod it. Any damage done to the car as a result of the installation or removal of the mods could cost you big at turn-in time. Plus, if you do the intake and the exhaust, and then have engine problems, they may refuse to fix them under warranty. Then you are really screwed.
2008 Sparkling Graphite 535i
2009 Land Rover LR2
2003 Porsche 911 Turbo (SOLD)
2006 Jet Black 325i (SOLD)
2001 Bullitt Mustang (450rwhp - SOLD)