1 7/8 KOOKS 351w swap headers mustang foxbody, These headers are primary tube 1 7/8, 3'' collecter size, 2.5 inch bolt spread in the flanges,jet cermic coated inside and out(when done).the collectors have 02 bongs welded in if you may need to run on efi car or wideband. These headers have been on my efi 408w gt car for 5 plus years and served me greatly, i vht header wraped the headers about a year ago to keep starter and under hood temps down the wrap has held up great and still looks good. these headers show minor signs of wear and tear from over the years small ding on the bottom of one tube (nothing serious) I will also include a set of stainless steel ARP header stud kit($80alone) and a machined spacer you may or may not need for extra chearance around the steering shaft.($50) i will sell and ship these headers for $450.00 or $400.00 you pay for the ride. thanks alot if any questions please contact me threw phone 413 885 5758 Tim