i don't see how ur lag will go up. With all that piping that you have to fill with that AHP kit vs. like an IRC kit with a bigger core with very short piping. there is much more volume to fill up in ahp's kit vs. a kit that includes even a 28" core. If i'm totally wrong then let me know, but look at how much piping is used in his kit vs. this one from slow boy racing.
that core from slowboy is 24x3.5x12 its a bigger core yet the piping is so much shorter. much less volume to fill. i guess u guys be the judge, but that's my opinion.