so i went to the track to test out what the obx header is good for. I am very satisfied at the results.
60'---2.303
330'--6.677
1/8--10.321
mph--67.34
1000--13.468
1/4--16.143
mph--84.03
my mods are obx header and custom axle-back.
Best run before the header is 16.6@81mph