Muffler advice

[Dubya]

sooo i am wanting to install a glasspack slip fit muffler on the truck like the one pictured below. how would i go about this? i am confused when it comes down to what size to buy? i have got the stock exhaust on my truck and this is the only modification i want to do to it. thanks

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[Horns]

I don't know what size tubing you already have on your truck but you can always go outside and measure that yourself. Then you'll just by the muffler that has an ID (inside diameter) if the OD of your pipe.

 

[bikerkid9069]

Probably going to be 3" in..