I looked for weeks for an exhaust system for my truck, then I found MBRP. These are simply the best systems and packages you can buy for reasonable prices. They specialize in diesel systems which is what first grabbed my attention then I looked further into their website. From the down pipe back is heavy duty aluminized steel that is guaranteed to never rust through, however surface rust is not warranted. Their tips are made of t409 stainless steel and will never rust not to mention they look sick! I couldn't be happier with the results after installation of this which was also pretty simple. The flow-through muffler design gives you that deep sound with a great turbo whistle. This was worth the buy and I highly recommend it.