MBRP's 4" DPF (Diesel Particulate Filter) Back SLM Series Exhaust System for your 2007-2010 GMC Chevy 6.6L Duramax LMM diesel pickup is made from 16 gauge T409 Stainless Steel, which lasts longer than aluminized steel exhaust kits. This free-flow exhaust kit does not come with a muffler or exhaust tip.