Have been slowing tweaking my R52 JCW. Have some past posts on when I put a RMW Dominator Cam, 450 injectors and a Jan tune. I have the money to go with the best but my upbringing of using common sense normally takes precedence. My car is pushing 12 years old and I just cannot see spending top money for mod parts. I bought an OBX 4-2-1 header off of Amazon when they had them on sale. I then did allot of research on high flow cats learning about s wraps and plain old coil wraps. I bought a 200 cell unit, got some flanges, an O2 extender and had a weld shop fab me up a unit that is 13" long. I am working on doing the same with a OEM cat that I found on ebay for $30. When inspection time comes I change out the highflow for the OEM unit. I did my research on the OBX so had a good idea of what type of HP and torque gains I would get. A friend has a R53 with a 17% pulley and a DT BPV. With the heavier weight of the R52 I was never able to match his acceleration until I put the OBX on. Throw in the extra bark that the OBX/high flow adds to the JCW exhaust and I am very happy. Not too loud, some nice pops and a great sound at WOT. On the way to the Dragon was getting just over 28 MPG that was also nice. Never had mpgs like that after I put on the 450s.