I've been doing a little bit of research, and true to every forum search, there is conflicting information out there, so I thought I'd bounce it around here before I committed to starting the car with, or without the either of the two systems. PCV: I'm pretty sure I'm gonna delete the factory PCV, and run a breather on each valve cover on the Cobra. There is an issue w/ these cars sucking oil past the factory system under boost, and after removing the intake and plenum, mine is the same. The detractors to doing this appear minimal,...some say that breathers are not as efficient as a PCV system, and will leave oil residue everywhere, as well as contaminate the engine oil faster. Others stipulate that there has to be vented catch cans with -10 hoses ran in order to control the oil spewed from the valve covers. I already have the breathers on each valve cover, I had them on the last motor. I had no oil residue on that engine, but then again it didn't have a blower on it. EGR: I don't like that hot assed tube back there. There are waay too many hoses and wires in this cramped ass engine compartment to keep a tube that gets as hot as that thing does back there. There were several crusty hoses that showed evidence of heat exposure because of it as well. I know that once removed, there will be a C.E.L. associated with it, but it can be turned off in the tune, so I'm not worried about that aspect. This car does not have cats, and Alabama doesn't inspect, so there is no worry there either. ( I do intend to add the cats back though, purely to clean up the exhaust.....I know the EGR delete will add to that) What I am concerned about is that some say that not running it is actually detrimental to the combustion process, and will actually increase combustion temps when deleted. Kinda goes against my rationale........How does getting rid of a tube that's purpose is to introduce hot air ( in the form of already burned exhaust gas) into the intake stream, end up being detrimental to the combustion process? If there was any other way to make this system work, I'd probably keep it.