Does the factory exhaust manifold look like a header? When I put my newly aquired 99 GTS on my lift, I noticed that it had headers, but the car was suppossed to be stock.
1998 MY changed from the cast iron exhaust to the short SS tube header. weight savings of ~23 lbs. If it's still stock yours will look like those in the pic below.
(***They will fit on 1997 and prior Vipers but only if you use a 1998 or newer cat flange so it's cut & weld or find late model cats.)
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