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They increase about 7HP and also torque. They weigh less. It's pretty damn easy as long as you can lift the rear with ramps or a jack. And the sound, oh the SOUND!
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2014 BMW X5 Sdrive35i F15
2011 BMW 328i E92 LCI
2006 BMW Z4 M Roadster E85
2013 BMW S1000RR K46 R.I.P. 
1998 BMW Z3 Roadster 1.9L E36 SOLD |