Exhaust annoying drone.

[michael lioce]

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I bought on Ebay a used exhaust upgrade that I've seen on line for about $3000.   The  price was $600 delivered so I thought, great.  After installing the system  ( headers, catalytic converters, plus mufflers with 2 nice round tail pipes) I was very disappointed with the sound.  At higher reves it sounds fine but at normal operation it's more like a bad muffler.  I was going to re-install the he old boring muffler and header but I thought maybe someone out there may have a suggestion for a fix for the new system.

This was installed on my 1997 Boxster.

Thanks

mike Lioce

[JFP in PA]

1 hour ago, michael lioce said:

 

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I bought on Ebay a used exhaust upgrade that I've seen on line for about $3000.   The  price was $600 delivered so I thought, great.  After installing the system  ( headers, catalytic converters, plus mufflers with 2 nice round tail pipes) I was very disappointed with the sound.  At higher reves it sounds fine but at normal operation it's more like a bad muffler.  I was going to re-install the he old boring muffler and header but I thought maybe someone out there may have a suggestion for a fix for the new system.

This was installed on my 1997 Boxster.

Thanks

mike Lioce

 

A belated welcome to RennTech 

While I hate to say this, you have just joined a lot of other people that discovered the exact same thing: Nearly every aftermarket exhaust system ever made for the 986 has droning issues.  Perhaps even worse, before and after dyno sessions have repeatedly also shown that most of these system do not add any measurable level of performance, and some actually lose horse power.  All they consistently do is make noise................

[michael lioce]

Thank you for confirming what I thought to be true.  Glad I learned for $600 and not $3000.  Thank you.

[JFP in PA]

Consider the $600 "tuition"......................😉

 

[lkchris]

Here's why it drones.

 

Unlike most cars that have their exhaust systems attached by hangers mounted to the under body, the Boxster exhaust system is mounted to the transmission ... which is mounted to the engine.

 

The engine and transmission mounts are "tuned" to the weight of the engine/transmission/muffler package and when you reduce that weight by fitting a lighter (they are always lighter because they are cheaper) aftermarket exhaust, you have made the system out of tune and the drone is the result.  There are actually aftermarket systems that do weigh the required amount.

[Ike84]

Thank you for confirming what I thought to be true.  Glad I learned for $600 and not $3000.  Thank you.

You may want to get on Amazon and but a pair of DB killers. TTGator on 986forum added them to an aftermarket muffler and it helped immensely.

I'm not sure about the weight being the only favorite with drone. I drilled through the baffle plates to bypass the stock muffler chambers and got a drone (without changing weight). I think the last issue is acoustical resonance, which is only eliminated by running the exhaust through a boat anchor of a muffler!

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