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Single in dual out 40 Series Flowmaster with side exit chrome tips

Palazzoblues

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Palazzoblues Enthusiast

Palazzoblues

Posted
Posted

Truck sounds awesome now. It's not as loud as I thought it would be. It's just a deep throaty sound and the 8 speed w/v4 mode really quiets it down on the highway. When it goes into v4 mode it does sound like the engine is skipping. In all actuality that is pretty much what this engine is doing. Technology over the years has made it possible. :) Also, I kept the stock exhaust and was surprised to see how restricted the exhaust really is. There is a gate inside the stock exhaust right at the exit of the stock muffler. I am pretty sure I know Chevy uses this to increase the temperature and back pressure at start up. It obviously opens up with temperature. But really? Is something this restrictive really needed?

 

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SouthernSilveradoGuy85 Senior Enthusiast

SouthernSilveradoGuy85

Posted
Posted

That's the flapper valve. It eliminates the V4 drone so you don't hear it. In V8 mode the valve is open. I put in a Flowmaster Super 44 single in/dual out muffler and I love the sound. I don't even mind the V4 drone since too me it sounds like an exhaust brake/Jake brake on a commercial truck which I love hearing.

Palazzoblues Enthusiast

Palazzoblues

Posted
  • Author
Posted

That's the flapper valve. It eliminates the V4 drone so you don't hear it. In V8 mode the valve is open. I put in a Flowmaster Super 44 single in/dual out muffler and I love the sound. I don't even mind the V4 drone since too me it sounds like an exhaust brake/Jake brake on a commercial truck which I love hearing.

I have not had a chance to get on the interstate and run it at 70MPH yet. I've only been able to hear the v4 mode for short stents runing 45 to 55. It does kinda sound sick, in a good way :) There's one thing for sure, I will not have to look down at the display all the time to know when it's in v4 mode. ;)

SouthernSilveradoGuy85 Senior Enthusiast

SouthernSilveradoGuy85

Posted
Posted

I have not had a chance to get on the interstate and run it at 70MPH yet. I've only been able to hear the v4 mode for short stents runing 45 to 55. It does kinda sound sick, in a good way :) There's one thing for sure, I will not have to look down at the display all the time to know when it's in v4 mode. ;)

 

Mine doesn't go into V4 mode much at all when on the interstate which most of the time I'm going 75. And ya, after the exhaust was done I don't need to look at the DIC anymore to know which mode it's in lol. Also with the stock exhaust and being my first brand new truck I did drive it like a grandpa. But once I had the exhaust done I went back to my old way of driving, maybe still toned down some. So because of that, my MPGs did go down for in town but no big deal really. I haven't always bought a full size Chevy truck for gas mileage lol.

MN1(SW) Enthusiast

MN1(SW)

Posted
Posted

I completely cut the exhaust on mine off forward of the flapper. It really wasn't that loud. Only time it was obnoxious was when I first started it on a cold morning. I even drove it all the way from San Diego to Mississippi and back with it like that. I almost went the Flowmaster route until I tried just cutting it all off to see.

 

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