i have an S&B cai on my truck and it is very good. the performance and MPG gains are good too.

 

My truck is a 08 with the 6.4 I went ahead and got the afe system took it for a drive and 10 miles out the check engine light came on called tec at afe .He told me they have that proplem on the 6.4 best to take off.and wait for them to fix the proplem.I'm sending mine back and looking for something differint.

 

That really sucks, I know AFE makes great products I have their Pro-Dry intake on my 2000 Expedition and just love it.
~Gage~

 

I know but they just don't have it yet on the 6.4 . they should have the system right before they sell it. Not try to fix it while they sell it . I got lucky I had a friend to clear the check engine code. If not afe was going to get the bill.