440 - 4 speed- dana60 - hooker fenderwells - Exhaust build.

I just started to work on my exhaust system on my Demon. It's a big block and I'm also using Hooker fendewell headers. But I noticed something the other night. The collector on the drivers side sits approximately 1 1/2" inches lower than the passenger side. Is this correct or are my headers FUBAR?

Ted