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Exhaust Note Rattle in Particular RPM Range (Catless + Cat back)

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7.6K views 6 replies 4 participants last post by  RedRS18  
#1 ·
Does anyone with a catless DP + Aftermarket catback (I have an AWE Track) experience an extraneous rattle in the exhaust note? I am experiencing this specifically between 2500-3200 RPM if I open the throttle up 60-70%+. I just installed poly exhaust hangers over the weekend. There is one point in particular where the exhaust is just shy of a finger width in distance between the heat-shield. I wouldn't be surprised if when the car is under load and the engine torques, if it is making contact here, under the right amount of throttle.

Any thoughts? I'd appreciate any suggestions.
 
Discussion starter · #3 ·
MN_RS said:
Probably the downpipe hangers. A few people have had contact there when the vibration is just right.
Click to expand...
Yeah, I think that's making some contact too. I've already made up a spacer between grey exhaust hanger piece and where it bolts. Seems to have helped some, but not entirely. It's kind of crazy that hitting right there would create a vibrating exhaust note, but I guess it makes sense.

I noticed some people have shortened the length of the downpipe hangers, but my pops is thinking we should try and bend them a different way, at 2 points, in each hanger. He thinks we can bend them so the downpipe will sit up higher. He's been a Master Diesel tech for 25+ years, so I am just going to roll with his tactics. xD
 
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