No dpf on 07 classic and under (gmt800) the new body style (gmt900) is the ones with all the emissions crap. Your 05 will have the LLY engine which only has an egr valve for emissions. The only other thing it may have is a doc which is a diesel oxidizing catalyst.
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DPF Delete?
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I took my 2008 duramax to relentless diesel in Willis and did a dpf delete with Eli life tuning on their dyno. Price wasn't bad at all. Gained 140 hp while keeping it around 700 lb of torque so I didnt need any tranny mods. Went from 14 on hwy to 19 running 33/12.50/20 tires. I have been very pleased and had no issues with truck or inspections.
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