Well I have a 94 f150 and I was wondering what you all think is the best exhaust system for trucks around this year with the inline six engine. My current setup is one cat, one pipe, glasspack, and turndown. I do have the efi manifold. I thought of getting true duals but have heard one pipe is better for more torque. Don't know if I want more horsepower or torque. What do you guys think?

 

You can't really have true duals on an inline engine and dual exhausts don't flow any better anyhow, especially on a truck that has to have the exhaust go from the drivers side to the passenger side and back to the driver side again. That's a lot of restriction on the driver's bank and uneven restriction isn't going to do anything great for you.

 

I would leave it single, at least upstream of the muffler. If you want the look of duals, just have a shop split it off after the muffler and throw the tips of you choice on there. Done.

 

I agree with all thats been said. Also, don't make the 4.9 loud or you probably won't like it. Keep it deep and mellow. I recommend straight through muffler over chambered.

 

You can do true duals but I've heard they sound pretty weird. Headers won't do anything over EFI manifolds unless the heads have been worked on. I've run the two factory cats then shot out in front of the back tire like a gen2 lightning and that was mild. Currently running first factory cat then the factory 3 inch into a stainless works straight through chambered muffler and split into duals in front of the back tire. Contrary to popular belief that 3 inch is way to big it runs just as good as every other I6 I've seen with smaller size tubing.

 

Thanks for the feedback everyone. My pipes are 2 and 1/4 inches because when I bought the truck the glasspack was straight off the manifold but I took it to a muffler shop and that's the diameter of the pipes they put on there. And you're saying it isn't worth it to do 3 inches? What about straight piping it?

 

I say no for straight piping it.

On the 300 a 3 inch single is not necessary, but will work fine. I would run 2.5 single on it. Then dual out if you want the look of duals.

 

Ok thanks, but why do you say it is not necessary?

 

i have an inline 6 and i read alot about these engines, here is what i found out abot the exhaust.
you CAN go true duals and it will help, these engines respond well to it. what you would need to do is run all new pipe from the split manifold back. 2.25 in pipe, hi-flow cat and any kind of muffler you want. then i would turn them out at an angle infront of the back tire. a glasspack would sound really good. 6cylbill had a set up similar to that on his 300 and it sounded and looked awesome, it wasnt a true dual though

 

He's saying that no more rpm than the 300 turns it doesn't need 3 inch to vent it all. It would just be your preference on the size piping, I got a muffler for free and it was setup for 3 inch so thats what I used. I've heard larger pipe gives a deeper sound but not for sure.

 

Inside the cab.

YouTube - March 24, Ride Along

Taking off from a stop.

YouTube - 300 I6, Flowmaster. For the guys on FTE. 2-12-10

Parked revving.

YouTube - Newest video, Oct 19 2009 Ford 300 I6 sound


My truck is too loud for my taste but I do love the way it sounds down low. The camera cannot capture the rumble. Unfortunately, as good as the truck sounds down low she still gets buzzy at certain RPM. Flowmasters are weird like that with six bangers.

However I have a Magnaflow on the V6 Escape and it sounds deep. No buzz.

Tell us precisely what you want? Loud? Or just a little tone?

 

If you search aholco (my channel name) on YouTube you can see different videos of how it is now. There are 2 revving it when in neutral. I still need an in the cab sound.

 

What do you want?

 

Whatever seems to be the best exhaust setup for this truck and engine. You have all provided good information and I think I will decide soon what to do with it. Thanks for te help.

 

I like your glasspack and cat. Why don't you like it? I think it sounds good.