According to n54tuning.com stage 2 will be $3150 with Pneumatic core w/o installation kit and $3350 with the P-core and installation kit which is a killer deal for about 500WHP. Please confirm that these will fit the F10 N55. I have been thinking about this for a while now. I may pull the trigger sometime next year (March/April) but I need to get some stuff in order now and start saving