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Exhaust 4.7L Exhaust Discussion


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  #1  
Old 10-01-2011, 11:07 PM
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Default Yet another exhaust question...

Like everyone else, I want my truck to sound like a truck. My friend has a 02 dodge just like mine "just a lot bigger" and I love the way it sounds, but he doesn't have a muffler, just cats, then it goes to a Y pipe "for dual's out"... my question is... with out a muffler isn't there a lack in back pressure?
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  #2  
Old 10-01-2011, 11:17 PM
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Yes, you do lose some backpressure and low end torque with that arrangement. It flows great at upper RPM's though.
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Old 10-02-2011, 10:26 AM
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how much low end torque? will i notice it when towing?
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Old 10-02-2011, 10:34 AM
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I don't have the numbers, but I do feel that you will feel it while towing as you want the low end torque...but if its light loads (few hundred pounds) you might not notice it
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Old 10-02-2011, 10:58 AM
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You will notice the difference. I notice the difference when I have a closed cutout versus having the cutout open.
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Old 10-02-2011, 11:55 PM
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ok thanks yall.
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Old 10-03-2011, 01:38 PM
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Quote:
Like everyone else, I want my truck to sound like a truck. My friend has a 02 dodge just like mine "just a lot bigger" and I love the way it sounds, but he doesn't have a muffler, just cats, then it goes to a Y pipe "for dual's out"... my question is... with out a muffler isn't there a lack in back pressure?
Sounds like you're all set but just wanted to add that losing back pressure will not hurt anything, so proceed without worry ....you won't lose low end due to less back pressure. It's a common "myth" that just about everybody out there believes.
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Old 10-03-2011, 02:40 PM
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so i wont lose the torque i need?
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Old 10-03-2011, 02:45 PM
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If you keep the same diameter exhaust pipe, and remove the muffler, you will only gain torque and hp at any rpm.

The reason people sometimes lose low end torque is because they change to a large diameter exhaust piping, and this slows down the exhaust gas velocity....and high exhaust gas velocity helps scavenging, and helps "suck" the exhaust out of the engine, so there is a balance in exhaust pipe diameter for best low end and top end performance. Stick with the stock exhaust size and you'll be fine, even if it was all straight through from the engine to the tailpipe...
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Old 10-03-2011, 03:08 PM
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well the exhaust shop just told me it would cost 300 for that set up. is that a good deal?
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