Finally, the MBRP Street Cat Back Kit (PN 7210409; $901.45) is the finishing touch on our exhaust project. The post-cat tubes also are T-409 stainless-steel and 3 inches in diameter. A set of polished, MBRP-embossed chambered mufflers are included with this set, along with polished 4-inch tips. One of the cool things we discovered about the MBRP pieces is that they will work with OEM H-pipes. So, if finances dictate making exhaust upgrades in stages, the MBRP after-cat can be your first purchase.