so ive got a flowmaster 40 series dual exhaust on my truck, and im wanting to get some jba headers. they have a sale on them for 350-471 on autoanything.com right now. my question is, ive heard that you lose some low end power with the banks exhaust if you get headers, but not if you have jba exhaust, which makes sense. but ive searched and searched, and havent found any info about gettin headers with the flow40. anybody else have this setup? and how does it run?