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Im looking to get a new Muffler instead of a full exhaust and i need to know the inlet and outlet on my new 2011 GMC Sierra SLE ext Cab?
thanks guys!
thanks guys!
Exhaust Inlet/Outlet size help!
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4,928 Posts
5.3 or 6.2?
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Had a 3" in/out magnaflow on my 5.3 I liked the sound. Just replaced my stock muffler for it but, today I put on a 2.5" bullet and I like it way more. How loud are you wanting to go?
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3,647 Posts
I'm also in the market for just a muffler. Just tuning in to this thread and doing some research. I'm wanting nothing too loud...just a nice mellow deep sound. 2008 Silverado 5.3.
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3,846 Posts
Worked wonders for me...3" inlet 2.75" outlet on '07 6.0 liter motor...
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up...
never had an exhaust on anything... goin to change this one. i want a low rumble. just BARELY louder the stock. but enough to know its v8..lol
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18-24" case muffler of your choice then. A chambered muffler gives a lower rumbling, but for just barely louder than stock you'll want one decently long.
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11,173 Posts
3" inlet/outlet for anything other than the 6.2 and certain 6.0's iirc.
I've always preferred Magnaflows... or a Dynomax Bullet if you want it a bit louder.
I've always preferred Magnaflows... or a Dynomax Bullet if you want it a bit louder.
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8,333 Posts
Darren is correct.
07+ 5.3/6.0 has a 2.75" factory pipe size. 3" will slip right over it. Go for that for inlet on the new muffler.
6.2L has 3.5 iirc? Might be 3.25" but pretty sure its 3.5(like 80%+ sure)
07+ 5.3/6.0 has a 2.75" factory pipe size. 3" will slip right over it. Go for that for inlet on the new muffler.
6.2L has 3.5 iirc? Might be 3.25" but pretty sure its 3.5(like 80%+ sure)
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11,173 Posts
'99-07 as well. :thumbsup:
And yeah I'm pretty sure it's 3.5"... I've heard of people running 3.5" and 4" mufflers on the 6.2's.
And yeah I'm pretty sure it's 3.5"... I've heard of people running 3.5" and 4" mufflers on the 6.2's.
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52 Posts
I have a Magnaflow part#12259 and it is very low rumble at an idle after warm up and great sound soon as you get on it and doesnt drone you out when cruising i have always ran flowmasters before and can honestly say i will not go back after this it is also 3" in/out on a 5.3
I have an 01 gmc sierra rcsb stepside with the 5.3 that i just put a flowmaster american thunder catback kit on. I heard a 3" in/out reduces your mpgs so i went with 3"in/ 2.5" dual out both dumping out the passenger side before the rear tire and it looks/ sounds badass! I got exactly the sound i was going for but may be too loud for some. I went with the 40 series muffler, 70 series i believe would be a little tamer. If I were to do it over again i think i would have done 3" in/ 2.25" dual out for a little bit more back pressure. Mpg didnt change after i started staying off the throttle to listen to the sound!
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That is what I am having installed tomorrow, can't hardly wait!:big_banana_Dance:
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Backpressure is a myth, it's all about exhaust velocity efficiency and a single 3" exhaust is pretty much optimal for a stock engine. If anything, that Flowmaster is reducing flow thanks to their inefficient chambered design, which also creates a lot of drone.
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186 Posts
I am going to have a 3 " in/ 3" out Magnaflow installed and leave my exhaust pipes the same. I guess I will find out soon, I am getting 15.8 mpg right now.
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im tuning in to since i got a dual 3 and 3 im looking at doing for my truck
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Some thomas v. nobody posts this crap all over the web about backpressure is a myth and sheep everywhere paste it on their websites and now its a fact. Ill go with what i know by trying different exhausts. You do what you want. I know at 20 you know everything so i should totally listen to you though.
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