They have changed their marketing strategy a lot since the late 80's.I started dealing with Kenne Bell back in the late 80's and early 90's when all they dealt with were Buicks.I bought several Turbo Buick parts from them and almost every part they sold they claimed would knock X amount of tenths of your 1/4mile times.If all of their claims were all true there would have been a lot of 9 second 1/4 mile Grand Nationals back then but most were 11-12 second cars.
Kenne Belle doesn't even sell turbo Buick parts anymore.There are probably less than 25,000 intercooled turbo Buicks left so KB moved on to bigger markets.

 

They should stick to Mustangs..
I, along with many others have been witness to the power INCREASES that both a cold air intake and an aftermarket exhaust produce on these F150's.
The combination with these two mods and a properly tuned PCM definately produces some substantial power gains. And yes, I have witnessed F150's dynoed in a progression where it was tested with just the intake, then with an exhaust added, and finally with custom tuning installed. And there was a definate power increase with each of the 3 installations.

 

I still belive that anything that helps your motor breath better, is going to help a little. I don't expect to get a 50hp gain out of exhaust, but a little gain is going to happen.

I think KB is simply trying to sell something.