Hello, I cannot afford to pay cash for a dual exhaust flowmaster kit and if I got one from Cabela's and or Bass pro, I would be able to pay it off in 6 months w/no interest. I have a '99 F150 4x4 w/ 5.4. I'm just wondering if there is a specific model I need to get through them? I tow a light 16' aluminum boat but may be into a bigger boat down the road. ALSO, HOW MUCH should I expect to be charged to have this installed ? Oh, before I tell you, I live in the rip off state of CA, so that means almost double price for installation right! I called my local Midas and they said $200.00