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Discussion Starter #1
Hey guys, just threw a Flowmaster American Thunder exhaust on my 09 R/T 6 speed. Sounds much better however I just found out the driveshaft bolts are hitting the passenger side muffler on occasion. Standing still it looks like there is plenty of clearance but I guess the exhaust is sliding around while driving. I loosened everything up, made sure the crossover pipe was on properly and it as far up as it can go. I tapped the mufflers on with a mallet and there is no more movement. I just don't have any other adjustments that can be made...has anyone else run into this? I guess I can just take off the X pipe and cut off some material. I just don't like how close the mufflers are to the driveshaft bolts. I have the kit with the slotted pipes and the clamps are very tight. Any info?
 

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I think I was one of the first to put this same system on a Challenger and had the same thing happen to me. When I took it for a test drive and hit it down good it started to make a rattling sound every time I took off from a dead stop. The pipes must have shifted and the passenger muffler was hitting on the rear driveshaft flange bolts. I removed the whole system slit the pipes and made sure everything was as far forward before I tightened everything up. No more problems. Quite a few people had the same problem with theirs also. Did your pipes already come slit right from Flowmaster. I know I had written to them and suggested that they slit their pipes.


Hey guys, just threw a Flowmaster American Thunder exhaust on my 09 R/T 6 speed. Sounds much better however I just found out the driveshaft bolts are hitting the passenger side muffler on occasion. Standing still it looks like there is plenty of clearance but I guess the exhaust is sliding around while driving. I loosened everything up, made sure the crossover pipe was on properly and it as far up as it can go. I tapped the mufflers on with a mallet and there is no more movement. I just don't have any other adjustments that can be made...has anyone else run into this? I guess I can just take off the X pipe and cut off some material. I just don't like how close the mufflers are to the driveshaft bolts. I have the kit with the slotted pipes and the clamps are very tight. Any info?
 

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yeah the pipes had slits in them already. the front of the scavenger had the slits, and the mufflers had slits. There is just no way these will go on any further and these clamps are locked down solid. I am thinkin I should take everything off and cut down a little bit on the x pipe where the mufflers go in...should give me more clearance. All said and done, the passenger muffler looks like it should have been designed to sit further away from the driveshaft
 

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yeah the pipes had slits in them already. the front of the scavenger had the slits, and the mufflers had slits. There is just no way these will go on any further and these clamps are locked down solid. I am thinkin I should take everything off and cut down a little bit on the x pipe where the mufflers go in...should give me more clearance. All said and done, the passenger muffler looks like it should have been designed to sit further away from the driveshaft
Had the same thing happen, everything is fitted dead on but it still rattled. This is an easy fix, just loosen both muffler clamps on eather side and tilt the mufflers away from the bolts on the flex disk...no more noise : ) Dont worry you wont see the mufflers from behind your car when your driving.
 

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yea i tried that too....fully tilted them and it has clearance but after driving for a little while the muffler starts to hit again. very annoying
 

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If the exhaust is still moving that means it's still not tight enough. What I did was marked the pipes with magic marker at the end of the overlapping pipe to see if they were pulling apart. Also put a straight line from one connecting pipe or muffler to the other to see if they are twisting. I have found Flowmaster Pipes to be very hard to collapse around the mating pipe thats why I slit the overlapping pipe.

yea i tried that too....fully tilted them and it has clearance but after driving for a little while the muffler starts to hit again. very annoying
 

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Discussion Starter #7
thanks for all the help guys....I cut 3/8" off of the crossover pipe and am no longer using the hangers that are closest to the mufflers. Problem solved. The original hangers were holding the exhause way too high and close to the vehicle which was causing the pipes to hit the suspension every now and then as well.
 
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