I had the 1 7/8 kooks headers installed along with their full exhaust system. The only fitment issue I had was with one of my over the axle pipes needed trimming down. No clearance issue with the steering shaft. Best two photos I could find.
I have a 03 Cobra heavily modded and a 14 Shelby mildly modded. Honestly I drive my 03 and foxbody twice as much as my Shelby. Now I love them all and hopefully I'll never have to sell any of them. But each one has their own unique characteristics. So like already stated it boils down to...
My dealer that I ordered my 2014 called this morning and said he has 2 more allocations available if anyone is interested PM me for the dealers name and #.