quarantine

With that logic...Aren't one piece plugs better than 2? If so, wouldn't Ford have done that?
Reality,noise is a big concern. That small tube acts as a silencer. Making for a quiet ride. Same as muffler. That 55 gallon drum under an F150 doesn't breath as well as a smaller aftermarket muffler.

Ftruck05

Really? You think that Ford would rather produce a "quieter" truck than one that's more fuel efficient? BS. Think about it. The 2 piece design was not seen as "flawed" until people actually started changing the plugs. Are you saying Ford has sabotaged the market just to make some coin? I don't think so. And as for the muffler. I agree it's huge and worthless, well except to all the EPA freaks that need to be pleased.

I've got a straight pipe under my rig and have done the DWV mod. The straight pipe actually helped. I gained 1mpg. The DWV on the other hand was just a cheap easy mod that has yet to prove any gain on my rig and I've yet to hear about another person gaining 3mpgs from it.

ElTauro

I'll agree that 3mpg is a bit much from this mod. I did a k&n filter, DMV mod, and an airaid MIT, and picked up a solid 1mpg. I might get more if I feather it around, but my foot seems to have gotten heavier with all the cool noises my truck makes now.

ricrok

Isanti.

Also, I just filled her up today and got 14.5mpg out of this last tank. I'm thinking I've been buying bad gas as my previous 2 tanks were from a holiday that I normally don't stop at and this last tank was from an SA where I normally do and my mileage dropped. I'm going to try that holiday again after I get this tank empty and see what happens. Still got 1.6mpg which is more along the lines of what I was expecting.

ElTauro

Any improvement is well worth it, considering the price of this mod.