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By way of the egr valve, IMO.
Not to add more frustration to the event, but if the CPFI and or spider pipe assembly is showing the slightest signs of leaking and you plan to keep the truck, replace the whole thing while you have it apart now. Otherwise you'll be pulling it all back apart again. Been there, done that, got the t-shirt (on a friend's 98 Tahoe w/5.7).