I purchased and installed the Roush extreme exhaust kit from Summit Racing 12/2011. After removing the stock pipes nand mufflers, just prior to installing the right muffler, we discover a hole in the welding of the inlet pipe. Tried contacting a freind to weld to hole with on success. Used JB weld as temporary fix. Before contacting Summit and Roush the rear seam of the right muffler produced a hole. Like the sound, but not the workmanship. Summit and Roush agreed to replace the mufflers only. The labor for the removal and reinstall is on me . Not at all happy with the outcome.