Yes the stock air filter and air intake system up the throttle body has to be changed. It should be a simple D.I.Y.*
*Unless you change the cone filter on these oil based air intake system routinely they have been known to pre-maturely kill sensitive MAFs(Audi & Porsches)
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house
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