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Vortec 6-0 Induction And Exhaust

knightgang

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knightgang Enthusiast

knightgang

Posted
Posted

2001 1500HD with 6.0 Vortec engine. Average milage is about 11.5 and best ever clocked was 13. I run 285/75R16 tires and I drive fairly easy in my opinion. I noticed on the exhaust, one the right bank pipe after the cat, it has a flattened spot (down to about 1 inch) in a bend over a cross member. So I feel confident that part of the mileage issue is the fact that the restriction in the pipe is keeping the engine from breathing effeciently.

 

Additionally, I am looking to change the intake to a Spectre Air Filter setup (similar to K&N) only a little cheaper.

 

What type of exhause system to you recommend putting on this 6.0 to allow better exhaust airflow and possibly a little better mileage?

 

Also, should I cut out the Cats, or do a CAT Back system?

 

Thanks

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

Nothing short of Corsa or you'll have HORRIBLE drone. Your not going to see much better mileage and the cross over pipe is like that on ALL the LQ4 motors.

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

The flattening of the crossover pipe is designed to maintain the same flow throughout even though the cross sectional shape of the pipe is different. You won't gain anything from replacing that.

 

DEWFPO

nbuchanan Enthusiast

nbuchanan

Posted
Posted

I had true dual exhaust from my cats back run on my truck with Flo Pro V-Force mufflers and it sounds really throaty (loud) and didn't break the bank. There is some interior sound from them but when you are running mud tires on the truck, interior noise really doesn't matter. For the milage part of it...it didn't change one bit. Also, I wouldn't get rid of the cats either because that will screw your milage up as well.

BlackZ71Silverado Senior Enthusiast

BlackZ71Silverado

Posted
Posted
Nothing short of Corsa or you'll have HORRIBLE drone. Your not going to see much better mileage and the cross over pipe is like that on ALL the LQ4 motors.

 

Really? Corsa is WAYYYYY over priced and doesn't sound all that great. MBRP make a good exhaust with no drone in the cab and it sounds great. You may want to check them out. You can buy 3 or 4 of them compared to paying for a ridiculous amount of money for the name Corsa. There are many alternatives, you don't have to spend your life savings buying from Corsa.

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

I didn't spend my life savings on one. If your stupid enough to pay full retail, sure... it's ridiculous money. But there ARE deals to be found :rolleyes:

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

If high-grade stainless isn't a must you can get dB exhausts cheaper than most anything else. And nearly everything will cause drone on the LQ4. I don't know what is unique to the HD trucks but they drone awful.

06_GMC Enthusiast

06_GMC

Posted
Posted

I have had my magnaflow on my truck for a few months now and the drone has slowly increased. Brand new it had no drone at all but as the packing has been beatin down in the muffler it now drones in the cab but not unbearably bad, since my wife never complains I guess. I love the way it sounds but it does only drone from 1700-2100 and thats it. Oh and I don't think it increased my mileage but interstate trips with the cruise a 70MPH I get right about 17 MPG's hand calculated with 265's on the truck.

knightgang Enthusiast

knightgang

Posted
  • Author
Posted
I have had my magnaflow on my truck for a few months now and the drone has slowly increased. Brand new it had no drone at all but as the packing has been beatin down in the muffler it now drones in the cab but not unbearably bad, since my wife never complains I guess. I love the way it sounds but it does only drone from 1700-2100 and thats it. Oh and I don't think it increased my mileage but interstate trips with the cruise a 70MPH I get right about 17 MPG's hand calculated with 265's on the truck.

 

 

If I were getting 17mpg I would be really happy. I had 265's on it when I got it and still the best I ever clocked was 13mpg. Don't think tires are the issue. 285's are the same as 32 's. Not like I am running 35's.

greezy Enthusiast

greezy

Posted
Posted

I was hesitant about putting a aftermarket muffler on my truck due to the fact everyone says the 6.0 is known for drone. I went ahead and put a FM Super44 on hoping it wasnt going to be real loud in the cabin. To my suprise its not half as loud inside as i thought it was going to be. The exhaust shop mounted the muffler as far back as they could. He said it would cut out alot of the incab noise. Sound is really deep and mellow. Very happy with it.

Grumpy Tooch Enthusiast

Grumpy Tooch

Posted
Posted
I have had my magnaflow on my truck for a few months now and the drone has slowly increased. Brand new it had no drone at all but as the packing has been beatin down in the muffler it now drones in the cab but not unbearably bad, since my wife never complains I guess. I love the way it sounds but it does only drone from 1700-2100 and thats it. Oh and I don't think it increased my mileage but interstate trips with the cruise a 70MPH I get right about 17 MPG's hand calculated with 265's on the truck.

 

me too, same setup. Drone increased a little, but it's not nearly as much as the competition and i think it sounds and performs better than them as well.

06_GMC Enthusiast

06_GMC

Posted
Posted

Well Eric the only thing too is you have 3.73's and I have 4.10's so that changes how the truck acts going down the interstate when it comes to slight hills and what not. Gregg do you have the 12599 also? I didn't notice any performance increase but I may just possibly notice a little seat of the pants increase down the road when I get an intake and tune.

Grumpy Tooch Enthusiast

Grumpy Tooch

Posted
Posted
Well Eric the only thing too is you have 3.73's and I have 4.10's so that changes how the truck acts going down the interstate when it comes to slight hills and what not. Gregg do you have the 12599 also? I didn't notice any performance increase but I may just possibly notice a little seat of the pants increase down the road when I get an intake and tune.

 

Read my info at the bottom, I got all that. Def better giddy-up with it all :dunno:

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