I have an egr from my 99 camaro. If you have an issue again you can have it cheap. Ask a breaker how much they want, might want to charge you the earth....if not try a good bit of carb cleaner on yours. 99-2000 are known for carbon and oil build up so could have got stuck.
You could get and LS6 intake. Had 3 through my hands for friends. Few mods to do re coolant pipes under the intake but its possible and few extra horses are always good. You need to tune the car to not have the EGR anymore otherwise the EML light will always be on.
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'99 Z28 A4, 253 LS2 heads, 228R TSP cam, Patriol Dual Springs, Double roller timing chain, LS6 ported oil pump, OBX LTs, 3" True Duals, LS6 intake, 42lb/hr injectors, SLP lid + bellow, EFIlive COS 3 Speed Denisty Tune (self tuned), 3200 Circle D stall, CAI mod, KYB AGXs, Eibach Pro Front Springs, UMI panhard, LCA + Brackets, Strut Brace, Custom Subframe connectors, WS6 axle with 3.42s, 18" American Racing Rebels, US mirrors, 93 tail lights, 3.5 inch custom cowl hood. Mickey T's Street DRs on Vette-ZR1 wheels for the strip !
Best ET: 12.0 @ 116 mph (on a 0-60ft of 1.8 s)