I changed plugs today put original Champions back in-took out the Autolites in it, did see something i havent seen, from the front of the motor back the plugs up toward the front of the motor looked normal almost no wear, but were worse further back i got almost to much wear , anyone ever seen this before. Truck ran fine, before and after just looking for possible cause...also what type of exhaust would sound good and also help with gas mileage....thanks


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