We are ready to build our first gt- 40 set of headers and exhaust, i would like some opinions {we all have them i know} on the bennifits of either going with an x-pipe 3.5 inch in and out, without the crossing over of the headers or crossing them over without the x-pipe. The motor is a high compression full roller racing 427 sbf. with a z/f I know the crossover sounds amazing, and I am not sure of the x-pipe. Technology has changed but that doesn't always mean things are better....talk to me guys...M