IF YOU LIVE IN CALIFORNIA AND HAVE ANY QUESTIONS ABOUT YOUR VEHICLE CONVERTOR / MUFFLER SPECIFICATIONS PLEASE FEEL FREE TO CONTACT ME HERE ON TO GET THE RIGHT ITEM TO YOU! WE UNDERSTAND EXHAUST PRODUCTS IS HARD TO UNDERSTAND. You are looking at :100% Authentic Wicked Flow Kamikaze Performance Muffler - 4"inch DIESEL RED EDITION4INCH 24 INCH LONG Hello and welcome to CaliCat and Muffler! We specialize in everything Exhaust and subside here in the Northern California region. IF you are a muffler shop or mechanic, please message us for business pricing and quotes. We offer free shipping and sell more items such as welding wire, cutting wheels, J hooks, AP Mufflers, Piping, Performance Mufflers, and much much more!!! All of our products are 100% Genuine, if there is anything wrong with the product we can always work something out within the 14 day return window. THANK YOU FOR CHOOSING CALICAT & MUFFLER!!!!