Rep Power: 264

quick question here I have I/H/E and a VFACII on the car now and the header is a megan racing header. The problem that I am having is I am getting bogged in 1st gear as soon as I let off the clutch it will go but it kinda lags until vtec kicks in at 2400 and then it goes. My question is, Do I need bigger pipes from the header back to get rid of the back pressure or could it be something else. I have the VFAC tuned and works great, but ever since I put the header after the VFAC was tuned its been lagging whenever I take off. If I rev it up a bit it doesnt do it but when I let off the clutch normally it lags until VTEC kicks in. It feels like it will stall but its doesnt it just kinda feels like the car boggs down a bit. Any ideas fellas. Thx

I could use a little feedback!! PLEASE!!