We’ve actually wanted to do this for a long time, but when it came time to swap, we realized that we’d have torun our car with stock exhaust manifolds on the dyno, and then take the time to swap them out for mid-length headers, run it again, and then swap the whole mess out for a set of long tube headers before running it on the dyno one more time. That could take days!Thankfully, that’s where our buddy Mike from the R&D department at BBK Performance entered the picture. There was an ‘11 Mustang with a 5.0 engine in BBK’s R&D fleet, and at the time we spoke to him it had stock exhaust headers on it.
