Ask Noble or Andrew Wagner why they both removed the EGR system in their twin turbo setups on the Duratec 3.0L. They will both tell you it was easier to remove it and program/tune around it, rather than implement it into their design.
Just because you have left over parts doesn't necessarily mean you engineered it better.
You can find many Subaru and 3000GT forums where they adovocate against stupid newbies who buy into the thought pattern that EGR = bad. So let's make this simple right now:
- If you like the sound of detonation and like going through pistons and engines left and right - go ahead an remove your EGR valve and watch the combustion temperatures spike.
As stated under cruise, idle and off-throttle the EGR activates and COOLS down the cylinders. It does not matter about 100% combustion at cruise, idle or off throttle, because if it were 100% combustion, the engine would be spinning at the redline and not 1,500 RPM. Cool cylinders with the HOT rush of air from turbos or centrifugal superchargers = good. Hot cylinders with hot rush of air = dead (or soon to be) engine.
Why work against yourself by removing the EGR? Sort of like removing your left arm just because you don't use it as much as your right.
