If you search egr you'll find a topic made by adamf about him doing this 4runner.

and don't use a thin sheet of metal(ie. a coke can) your exhaust will eventually burn right through it.

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.