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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 03-16-2016, 07:12 PM
pkrue668 pkrue668 is offline
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Default Exhaust help!

Back in December I purchased an 07 1500 sport 5.7 hemi that already had an aftermarket gibson exhaust on it. I enjoyed the sound outside the vehicle but inside it had quite a drone in the lower gears around town. The entire exhaust was rather rusted and barely holding together in some places so I did my research and choose a magnaflow exhaust as most reviews were great in terms of being quiet in the cab. Today I installed the new magnaflow and it is much quieter at cruising speeds around town but the drone is still there at times and much worse on the highway.

My questions are 1, am I destined to be stuck with some sort of drone no matter what? And 2, is there a break in period I should consider?
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Old 03-16-2016, 10:46 PM
BlueHemi BlueHemi is offline
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Which magnaflow muffler did you get?
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Old 03-17-2016, 12:17 AM
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the body should be 5x11x22 (or more), any smaller and it will drone...and consider dumping it post axle, it's the additional piping that's resonating..
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Old 03-17-2016, 08:48 AM
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That's probably the issue, the cat back system came with a 5x8x18. Would a quality resonator help in this instance? I hear they are usually supposed to be placed after the muffler but this specific setup doesn't leave enough room. Will it still be effective before the muffler?
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Old 03-17-2016, 09:45 AM
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how is your piping setup after the muffler..in stock situations, the reso is place right after the pipe goes over the axle.. not sure about it a reso before muffler...forgot to mention that I did run an 18" magnaflow before and it droned like a mutha right around 2k rpms.
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Old 03-17-2016, 12:23 PM
pkrue668 pkrue668 is offline
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It's about 4' of straight 3" pipe to the muffler just before the axle and then 3" curled over the axle and out behind the passenger rear tire. Problem is that a resonator would not fit after the muffler, only before, is that a problem? It drones like crazy from about 1600 to 2200 rpms.
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