MP 509 cam

IMO it is absolutely worth the money. There isnt a single modern car that is produced without a roller cam. Present day oils do not contain the necessary zinc to keep a flat tappet cam alive in the long run. Roller cams idle better, make more vacuum (because they open and close the valve "quicker" they have less duration for a given lift) and have a better power range. When my 509 cam wiped a lobe I went with a hydraulic roller cam and couldnt have been happier.