im trying this little trick now. last sat. at the track, at about 900', my egr valve blew open and dumped my boost. i had a great run going, (1/8 mile was 9.54 sec @72.95 mph)
it was defintly a low to mid 14 run until it blew open. right before that, the egr was rattling so bad that it sounded like a machine gun. (i was running 112 oct, sunoco race fuel, 3 heat range colder in plugs, so i know it wasnt detonation) i just figured that with the 142,000 miles that is on my car, the springs were weak in the egr valve or it was just worn out. the dig. egr is very expensive. (like 200 bux and up.) so i removed my egr valve, made a template out of 1/8" alum. and mounted it just under the egr valve so it blocked off all the holes under the egr. it worked great, no more pinging. just wish it wasnt freak'n raining so i can go to the track.
there is one fall back to this mod, after awhile , it will set a SES light code 54 ( no flow detected to the egr) but if you can live with the light and not spend 200 bux +, this is a cheap and easy mod. i also feel that part of my knock retard was coming from the egr rattling with the weak springs in it.