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f.monroe · 05-29-2006, 12:12 AM

I am sure someone will give you a more specific answer but bigger isnt always better . A stock engine wont perform as well with a larger diameter header as a well built engine . Too large of primary tube will not provide enough back pressure and will cause problems . I have heard of engines running hot due to using too large of a primary . If your engine is stock to mild , I would use the regular 1 5/8" tubes . Frank

05-29-2006, 12:12 AM	#2
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Re: Question on header diameters.. I am sure someone will give you a more specific answer but bigger isnt always better . A stock engine wont perform as well with a larger diameter header as a well built engine . Too large of primary tube will not provide enough back pressure and will cause problems . I have heard of engines running hot due to using too large of a primary . If your engine is stock to mild , I would use the regular 1 5/8" tubes . Frank __________________ Born and proudly residing in a Red State !