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I recently bought a 05 LLY and previous owner had a Hoodstack installed. I bought everything to swap it over to a normal exhaust. I'm in need of v band Clmap though from the Downpipe to Exhaust and don't know what size I need. The downpipe is PPE 3 inch, and it goes to a 5inch Exhaust but the front pipe is only 4 inch? Any help or answers would be appreciated.
 

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2007 GMC Sierra LBZ
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Here is the GM part number. 11611439. Search eBay using the number and gives you lots of options.
 
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