The H-pipe is a welded assembly that slipped easily into the muffler inlets. Elevating the H-pipe to the proper height was easy using three sturdy boxes. Note that the pipes bend slightly upward at the rear of the assembly and slightly downward at the front. Our installation is actually upside-down from what Flowmaster recommends, but we found this orientation tucks the mufflers up within 3/4 inch of the floorpan, affording awesome ground clearance. Our method will, however, put the H-crossover closer to the driveshaft, so check to make sure it doesnt hit.