Just as an FYI, out catback kits for the G8 all have an X pipe. The X pipe is actually built into our muffler. The muffler is 4 chambers of tight packing surrounding a true X pipe. The muffler is designed by us, and gives you all the flow characteristics of an X pipe, while keeping unwanted noise out of the cabin. The J pipes in the rear also allow us to only use one mid muffler, instead of two larger ones in the rear. It looks a lot cleaner from the back, and also reduces weight. Thanks so much and feel free to contact me anytime with any questions or concerns.
Steve Mariano
Solo Performance Sales and Customer Service
516-655-9002