i think all the sets i installed were used...lol..bets thing if you buy a used kit is sand them down and spray them with 2500deg header paint..i did mine 2 yeras ago and still look the same..
wit MAC long tubes they are individual primaries but unlike the shorty headers you can "perswade"
these enuff with you hand to get the bolts to line up unlike the shorties when you really had to use a long screwdriver/prybar..to me i would rather have to do an extra minute work to begin with with the MACS then buy connected flanged like BBK and get leaks more often..infact b4 individual flanged came out(were talking 60's) poeple used to hacksaw the flange so they would be individual...
sound will be louder and you will get all around power..after owning long tubes i would NEVER EVER buy shorties again..they make the engine look cleaner, less heat under hood..easier IMO to work on
will you be going with the prochamber, regualr H, Xpipe cats no cats????