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16 Kooks has these 15/8 inch headers in stainless for Metric chassis race cars. Stainless may seem a bit much for a Street Stock class, but at less than 450 bucks, they are practically a steal. Unfortunately, we ran into interference issues and couldn’t run them on the dyno. We couldn’t get the header bolts tight enough to seal to the heads because the outlet was against the rear leg of the dyno stand.