on a sb,the performer 318/360 is just lighter/smaller runners at the head opening/needs opend up on 360 heads and not much better than a stock intake

the LD4B and LD340 is night and day and way better

the CH4B is the BB LD intake more or less,way better than a plane BB performer

the ticket now days is the performer rpm intakes,kinda best of both worlds for street and strip

not a bad deal for the weight reduction though and will be on level with a stock intake

I run the old skool LD4B/LD340 on the sb and have a weiand action plus for my stock 440

which was way better than the stocker or the performer BB intakes