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I'm new to BMW but not at all new to building cars, I recently purchased an 07 328i coupe, 6 speed manual. PO gave me every receipt since it was new, exceptionally clean car and very well maintained. I bought a 3 stage manifold this morning and just bought a magnaflow catback about 30 minutes ago online. I've also deleted the carbon filter and installed the silicone intake hose. I'm considering the AFE headers but cannot stand the drone(I'm 51) but I am looking for some hp gains, I don't need to squeak out every HP I can but looking to get the car a little more responsive, I'm more of a corner guy than a straight line guy. Because if you can corner well you can out run a guy with more HP imho. Given what I have what would any of you do? Delete the secondary cats? Resonator? Any help would be greatly appreciated. Absolutely impressed with the car. Ken
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