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For what it's worth, you might be further ahead to buy a set of Dynomax coated headers and sell your other set to off set the cost. From what I've seen to have a set coated is around a couple of hundred buck or more depending on the shop.
I just paid $230 for a pair of big block headers to be coated here in Michigan. I think the guy did a much better job than what the header manufacturers normally supply.
Kenzy, it's not the DPFI/O2 sensor that the problem, it's the rack and pinion steering with my own installation that is...headers on the car NOW are differant than most vette headers, off a spec dirt? track car type setup, and so do not interfear with anything ever....that's why they were chosen, and of course the racer down the street had them in his hip pocket for cheap, used....another nice thing....they are Schoenfeld 151 headers...and I just ordered another set, and need modify them slightly and put them on the car for fittment...then need them sent off for ceramic coatings....