Ok ready,., I if it where me wouldnt waste my $$$ on headers they are a PIA if you do it yourself or the cost to pay someone to install them is not worth the gain, If you have GEN 3's already, Get a cat back and I tune, you be close to 300 WHP and a good 245-255 WHTQ( Assuming you have a manual). When you get tired of that go FI if you want, But headers and HFC's are waste of $$$ to me. I made 298 WHP and 240 WHTQ on a mustang dyno, Auto 7 spd X Coupe, With Gen 3's, cat back and tune, stock cats and manifolds,
My sig numbers are of course FI, cat back ,Stock cats and manifolds.
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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