My son and I just installed a Magna flow dual-out-side-infront-of-rear-tire exhaust. Pretty simple install. I bought it from Performance Peddler. Had a challenge with the order, I called and they made it right. Great service, they do exactly as they say. It is nice to do business like that. Thanks guys.

Heres the question.
Exhaust sounds great. Really nice rumble just like I wanted. What I did not expect and hope you all can help me with the cause and cure is the exhaust hiss. When your foot is in the throttle at about 3000 rpm you start to hear a hiss through the rumble. You have to be in the throttle at least a little. If you just keep the trans in 1st and slowly speed up past 3000 rpm you will not hear the noise. It sounds as though I still have a lot of restriction and back pressure.

I remember the old big block 4 door family truckster type cars back in the late 70’s early 80’s with a single exhaust pipe trying to exhaust all those ponies. They sounded just like that when you had your foot to the floor only no rumble, just all exhaust hiss from all the back pressure.

So tell me
Is it back pressure? Does anyone else have this issue? What is the fix?

Thought I would add. 5.4 no other mods.

Thanks

 

im not sure on the problem, But I once had magnaflows, and they did that, seemed to make a lot more "air" noise that tone...

 

That's it. Quit a bit of it too.

 

I had the same problem with my old 2001 Ranger 4x4 4.0. I cut out the stock muffler and had a flowmaster 50 delta flow welded in. It worked PERFECT for me...except for that hissing air psi noise when you put your foot into it. The fix for me was to take it back to the local muffler shop and have them up size the pipe from the cat back to 3" (stock was 2"). Hope that helps!

 

If you clamped it in, double check your clamps make sure there aren't any loose spots.

 

I had not thought of that. I have enough miles on it now that it should show any exhaust leaking.

I'm going to find a local shop and talk with them. I think about having them run duals to behind the tire or out the back. I don't know, I'm guessing but I think maybe a little more pipe on the end of the muffler would help??

I hate to involve the local shop i will have more $$ in this system by the time i'm done than if i were to have went to them in the first place.

 

lot of people viewing but not much help. i don't understand. No one has any more help or thought to offer.

No leaks. Guy who insalled my front end leveler said he thought it was the engine sucking air and would get worse if I were to install a CAI.

This noise (vacuum, air, hissing) is heard at the tail pipes not front end. Now it does make sense it could be the engine sucking air cause that is when my foot is in it and it does need more air. is it possible to hear that all the way through the exhaust system??

Anyone else understand enough to explain it an better.

 

Is your tip sticking out like 1" away from the bed? It could be when your driving air is going into the tip and causing the hissing sound maybe.