wanted set of equal length headers.
 

Useder the better. Is useder even a word? anyway not much to spend. but what do you got and how much?
thanks Mark

Sorry, exhaust headers equal length for 16 valve 928 aftermkt. Thanks Mark

I have a pair of used MSDS headers for $200

I have a used set of MSDS TUBE headers for $200 in NC. I can email or possibly text pics from my phone.

how much power do th headers add ??

added power?
 

It depends on how restrictive the original exhaust system was. Mark Andersen has dynoed his engines, I'd guess and should have a definitive answer. In the muscle car days of yester year, a 10% minimum was expected. In a GTO with 400 c.i. you could feel it like a kick in the pants, with 4.5.5 litres, maybe not so much.