IIRC somebody on the old SVT Tech Forum did this (Elizebeth?). I remember reading that there was a significant amount of flashing on the OEM headers that could be taken off with a file. I'm sure you could do some good by matching to aftermarket headers too. Might as well do it while you have everything torn apart...

flyer1704

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'99 SVT Contour, Black/Tan
K&N Filter, B&M Edge Shifter, Dynomax Bullet (In Place of Rez), Alpine/BA Stereo, 'Foamed' Chassis

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'99 SVT Contour, K&N, B&M, DMD, 'Foamed' Chassis