Nst pulley kit & DC Header

Amarcord said:

But wouldn't headers only really come into full use when you tune the ecu to compensate for them.

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Not at all. Adding only 1 or 2 pieces doesn't help nearly as much as all 3. You must install the intake, header, and catback exhaust so that air can flow into the engine, out and exit through the exhaust. The OEM ECU has the ability to adjust more than most people know. My tuner that did the dyno run told me that. With a tune I would get even better results.