If you're concerned that it's plugged, check it after a highway drive. If you think it's plugged, remove & clean it. A coat hanger & some carb cleaner should do a fine job of removing any obstruction.
The EGR doesn't significantly enhance performance - it's for durability & emissions. So a non-functional EGR system won't be immediately noticeable. It will damage the engine, though, if left long enough. Read
this.
Timing should be 10�BTDC, following the procedure printed on the VECI label under the hood.
I hope your homebrew isn't an open-element filter (hot air), and Bosch plugs don't seem to work well in these engines. Most people get the best performance with Wal-Mart's cheapest Autolites.
I checked it a few times and it got hot after a long drive - I pulled it anyway and the hole leading to the intake manifold was nearly blocked so I cleaned it -
The bosch plugs have been in there for about 2 years and I have not noticed anything adverse with them (platinum 2) and they are still pretty clean -
Yes the intake I have made is exactly as you described but I put a Dry charger sock on it for easer cleaning - I agree with the fact that its clearly a hot air intake but having that egr blow hot air thru the manifold is just as counterproductive - I did put a duct in from my lower bumper to scavenge some chill when moving and its been a pretty good success thus far -
scary thing - my timing was set to 8 deg btdc and I ******** it to 12 where I am pretty happy right now - she idles under 700 rpm
the steering however is having this bind when turning right mostly where the range of movement is blocked until i give it a slight jiggle - to me this is unacceptable - the wheel has a slight up and down jiggle to it that is unrelated to the tilt function - what could cause this random bind in my steering, and what can i do to fix it??