Less low end grunt after exhaust install? - JeepForum.com
 
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post #1 of 5 Old 02-11-2011, 05:20 PM Thread Starter
nassin2
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Less low end grunt after exhaust install?

I just had 3 inch magnaflow exhaust installed on my 5.7 gc. It sounds really nice and all but my seat of the pants impression is that it doesn't seem to have quite as much low end power as before. They removed the resonator by the back bumper when the exhaust was installed. I'm wondering if maybe I lost some needed back pressure. Has anyone else noticed this after having exhaust installed?


04 WJ Limited 4.7, Quadradrive, 2 inch BB, Skyjacker 8000 nitros, rough country stabilizer, hella lights <--Totalled
05 WK Limited Hemi, QD2, K&N intake, Magnaflow exhaust
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post #2 of 5 Old 02-25-2011, 05:40 AM
DAHEMI
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was hoping for some replies as I'm following that other thread before splurging on an exhaust. my WAG is doubtful the muffler swap and resonator delete effected low end much. that big ole Hemi is already necked down to a single exhaust and the resonator isn't much of a restriction itself just a sonic tuning aid. you should hear my neighbor warming up his Hemi Ram every morning. good thing I like harmonics and drone. even at oh-dark-thirty in the morning love that V8 rumble!

has there been any other changes in driving / mpg? going for the Superchips later?

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post #3 of 5 Old 02-25-2011, 06:12 AM
jmohlerfaria
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little light on the low end

re-increase your back pressure.
should help restore the low end.
did you change anything else?

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post #4 of 5 Old 02-25-2011, 01:09 PM
90grandoneer
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You may loose a very little low end with the 3 in. system, but overall (city/highway) you will see improvement. The biggest problem with the Hemi breathing adequately is the stock exhaust manifolds. Although they port match the heads (1 3/8 in.), internally the ports dump into each other from front to back and exit into a 1 7/8 in. ID collector. With the firing order as it is, not all of the cylinders scavenge through the manifolds adequately, especially the driver's side. Once into the single system they should scavenge better than a dual system. I would guess that you have a pretty big drone issue on yours without any other silencing other than the Magnaflow. Which one do you have. On mine I have two 12 in. glasspacks (one in front of the Magnaflow and one in the resonator position) and a 14589 Magnaflow, and it is just barely passes the wife test, especially when the MDS is active. In V-8 mode it's not too bad.

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post #5 of 5 Old 02-25-2011, 11:39 PM Thread Starter
nassin2
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After having the exhaust for awhile it sounds really nice with no noticeable drone. I have the big body magnaflow and that really melllows out the exhaust tone. The exhaust combined with my K and N intake makes for some really nice noises The low end really isn't much different after getting used to the exhaust.

04 WJ Limited 4.7, Quadradrive, 2 inch BB, Skyjacker 8000 nitros, rough country stabilizer, hella lights <--Totalled
05 WK Limited Hemi, QD2, K&N intake, Magnaflow exhaust
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