I simply unplugged the connector on the EGR motor and removed the EGR exhaust feed tube from teh intake and exhaust manifolds (when I installed my longtubes).
I raised my EGR Enable Speed to 256 mph so tehEGR will never try to turn on. Then I turned off the EGR flow detection and its related OBD2 reporting so I dont get a CEL or SES light.
Any Professional PCM tuner can do this for you.
There is no performance to be gained whatsoever by removing EGR. The only reson I removed teh EGR on my 1997 Vortec 350 was so I didnt have to weld an EGR exhaust feed bung into my new ceramic coated headers.
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