I took my car to atco race way in N.J. and ran it.
It was .2 sec faster on average with the intake I made and a magnaflow muffler.
I know this is not very scientific because I ran it on different days.
I will say the crossfire is very consistent.
I ran 15.2 average of 5 runs with the stock set up.
I ran 15.0 average of 6 runs with the one I made.
My best run was 14.92 so technically I can say my car runs 14's lol. hahaha.
Oh and my car is an '04 auto...
I like the sound it makes, I plan on having the computer programmed but I have not gotten around to spending the money and having may car down while it gets done.
Let me know if you have any questions.