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Its a tough call. Do you do short or long trips? Most cars respond better to a warm air intake or a short ram so they suck in heated air from the engine compartment. Some cars and those that make longer trips than 7 miles likes cold air.
Where is the power? Down low or up high? If up high, then a 4 to 2 to 1 tri y header will lower the power band and allow you to short shift.
A 4 to 1 collector raises the power band.
Mufflers add weight and reduce torque.
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