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RedFR-s already explained that NA headers can't be used with most turbo setups but didn't answer the question of best NA header. Ace is widely regarded as the best NA EL header and the only EL header capable of eliminating the torque dip. pTuning also makes a proven race header for peak HP gains but it retains the torque dip like all other EL header designs. If you want the best, I'd stick to these 2.
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