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Old 10-28-2009, 10:48 AM   #1
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muffler back pressure

so will a super 40 type muffler (2 chamber design) center/offset give me more back pressure compared to a Banks Monster Muffler which is a center to center straight through design, much like a cat.

i have the banks but would like a little more power climbing hills on the interstate, a chambered muffler like the super 40 should give me the back pressure and power to roll over hills that i am missing right?

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Old 10-28-2009, 10:52 AM   #2
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the only difference will be in the tone of the exhaust. you want more power add a header and a bigger bore throttle body

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Old 10-28-2009, 11:01 AM   #3
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any other input. im talking back pressure here, im going to be gaining back pressure right, which in turn adds a little more low end torque and a bit more passing power right, has to be more than just sound.

i currently have an oem header, which is not cracked, and direct fit Magnaflow cat and a Banks Cat back exhaust kit. muffler is a straight through design
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Old 10-28-2009, 11:08 AM   #4
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People pick up from muffler/cat advertisements that back pressure is always a bad thing, it's not. It's like all the ads pushing so-called "low resistance" ignition wiring which sounds good to the unitiated but which doesn't help engine performance in the least. The engine needs a certain amount of resistance to work into and if it works into zero resistance, to take it a bit further, it won't put out as much torque. Engines/motors develop the most torque when working into resistance and a certain amount of backpressure is a good thing for automotive engines. It takes a specially designed engine (especially the camshaft) to work well into no or significantly reduced back pressure.

Jeeps aren't racers (well not for most people) and I wouldn't worry about things like backpressure. In most cases, getting rid of back pressure will give it slightly more HP when at extremely high rpms but usually at the expense of reduced low-end torque.
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Old 10-28-2009, 11:24 AM   #5
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so should i keep the straight through muffler on and save my pennies?
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Old 10-28-2009, 11:55 AM   #6
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unless you want a nice rumble... yes
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Old 10-28-2009, 09:41 PM   #7
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Quote:
Originally Posted by Jerry Bransford View Post
People pick up from muffler/cat advertisements that back pressure is always a bad thing, it's not. It's like all the ads pushing so-called "low resistance" ignition wiring which sounds good to the unitiated but which doesn't help engine performance in the least. The engine needs a certain amount of resistance to work into and if it works into zero resistance, to take it a bit further, it won't put out as much torque. Engines/motors develop the most torque when working into resistance and a certain amount of backpressure is a good thing for automotive engines. It takes a specially designed engine (especially the camshaft) to work well into no or significantly reduced back pressure.

Jeeps aren't racers (well not for most people) and I wouldn't worry about things like backpressure. In most cases, getting rid of back pressure will give it slightly more HP when at extremely high rpms but usually at the expense of reduced low-end torque.
Not arguing with your info, but mudslinger was asking which one will produce MORE backpressure...by the sounds of it, he's opened his exhaust up a bit too much and lost a lot of his low end torque and is looking to gain it back...so he's wondering which muffler will allow him to accomplish that. Just wanted to clarify a little...
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Old 10-28-2009, 09:48 PM   #8
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Since we are on the subject, will going to a flowmaster 40 from stock reduce the back pressure too much?
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Old 10-28-2009, 10:52 PM   #9
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i went from a banks to a super 40 i didnt notice any performance loss or gain. just sound and the super 40 sounds so much better. its a much deeper throaty sound.
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Old 10-29-2009, 06:12 AM   #10
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I put a Flowmaster 40 on yesterday. Your right, deep throaty sound. Very nice!
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Old 10-29-2009, 07:42 AM   #11
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what are we talking $$$ wise for the super 40 muffler
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Old 10-29-2009, 08:49 AM   #12
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what are we talking $$$ wise for the super 40 muffler
Muffler only...just under $100 + shipping.
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Old 10-29-2009, 09:59 AM   #13
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got mine from PepBoys for $37.99 they were having a muffler sale and the lady mixed up prices on a thrush and the 40 series so i lucked out lol
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Old 10-31-2009, 06:46 AM   #14
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I got mine for $120 installed at a mom and pop shop. Some of the chain stores wanted double that, shop around!
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Old 10-31-2009, 07:57 AM   #15
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back pressure

Hey harley harv...I'm not an master tech on jeeps however, I do service Harley's and do a lot of mods that the dealerships can't (or won't) do because of warranty's, knowledge etc.. When it comes to back pressure on a harley, it's very similar to car and truck engines...a certain amount of back pressure is critical, moreso on the v-twins. That's why you hear a lot of bikes popping and making noises not becomming of a finely tuned engine. Since you already installed your new muffler, my only advice is if it runs and sounds good you have accomplished your goal...Like on a Harley, the ECM will make very minor adjustments to correct and compensate for modifications as long as they are not too radical...Good Luck

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