I have become a dealer for Stainless Works, I'm working on my first order and if I can get a few people to order some items as my initial purchase I can save myself and you some money.
Take a look at the items here, if you are interested let me know, I can respond with a price by PM.
Flex/SHO downpipes
http://www.stainlessworks.net/products/headers/2010-ford-taurus-sho-downpipe.html
The product description shows SHO but this also works for the Flex.
SHO Exhaust (won't work on Flex)
http://www.stainlessworks.net/products/exhausts-catbacks/2010-ford-taurus-sho-exhaust.html
F150 parts:
http://www.stainlessworks.net/ford-ecoboost/
Take a look at the items here, if you are interested let me know, I can respond with a price by PM.
Flex/SHO downpipes
http://www.stainlessworks.net/products/headers/2010-ford-taurus-sho-downpipe.html
The product description shows SHO but this also works for the Flex.
SHO Exhaust (won't work on Flex)
http://www.stainlessworks.net/products/exhausts-catbacks/2010-ford-taurus-sho-exhaust.html
F150 parts:
http://www.stainlessworks.net/ford-ecoboost/