So I currently have the C&L CAI and tunes from Doug and a flowmaster A/T muffler but want to switch to the FRPP Duals. Do I need or should I get a new tune from Doug for that?

shouldnt need one... i think dougs tunes account for duals anyways so it should give you a bit more power... i might just be making that up tho.

no programmer tuning required on exhaust related mods. if you had gone duals before the tune and cai, you "might" experience a drop in torq (due to a decrease in the velocity of exiting gases). the added power (plus the increase in exhaust volume) from the tune/cai helps make up for that. in other words, you're good to go duals ;).

yea no need to waste money on a new tune go duals and make urself happy and ur neighbors mad lol (especially late at night)