Ok so I have the MBRP 5" side exit kit. What I'm trying to find is the necessary parts to go from 5" to 7" stack. I found the 5" flex pipe and the 90* elbow on store.airflow.com. What else do I need?

Clamps and a short piece of 5" pipe to go between the 90 and the stack. A bottle of jack Daniels to go with the 6" hole saw may be required to get the courage to blow a 6" hole through your bed.

Haha that is hilarious! But I already have a 5" hole for my old 4" to 5" duals but wanted to switch to bigger. Thanks for the info...I should had all the necessary pieces then.

Sure man but you should enlarge that 5" hole some or that thing is gonna rub and rattle like a mother.

Ya I will for sure. Time to get the plasma cutter back out.