Okay then maybe you can explain something to me. The exit off the rear manifold comes straight down, bends, and then starts to head downstream. The exit off the front runs under the oil pan, bends around a few times, and then ends up right next to where the rear one is. That means you already starting with a large difference in temperature between tubes. From here, you can work your way downstream to find the best point, but what about cats? Those have to come first especially when you have headers for emissions. Now you have a choice. Either find the best point after the cats or find the earliest point after the cats. Also, since an x-pipe has to be mounted at the same point on both pipes, you will have to choose the same location on both pipes. Having said that, I'm not sure how you can optimize this set up. Maybe I'm wrong. Maybe I got lucky. Dyno next month will tell my story.
