Raced My Buddy In His 99' Si.....

ok well me and my buddy decided to run tonight to see who could win.. I have a 00' Si and he has a 99' Si.....first off we both have cold air intakes, and full cat back exhausts...the only mod he has up on me is a DC sport 4-2-1 header and a fuel pressure regulator..ok so we start from a dead stop and I took him off the line and all the way through 2nd gear..then at about the top end of 3rd he was up on me by a friggin front bumper...so we continue to about 110 mph and it stayed that way, just a front bumper!! so my question is could his header and fuel pressure regulator make that little bit of a difference?? or should he have been ahead more than that? thanks guys...let me just say it was a great race and we were neck and neck till the end...