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YOUR RESEARCHFabspeed exhuast resonance fixed-$15 - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Typically it was the worst when decelerating through that rpm.
Fabspeed exhuast resonance fixed-$15 - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'worst' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'worst' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Use tapatalk' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I couldn't find Oatey brand in Australia but instead used the Tradeflame Brazing Heat Mat which is good for 1000 degrees Celsius (1832°F).
Fabspeed exhuast resonance fixed-$15 - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Fabspeed exhuast resonance fixed-$15 - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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I recently put on a Fabspeed maxflo exhaust with the sport headers. I absolutely love the sound of the exhaust. The only problem was that around 2200RPM, it would resonate pretty loudly. Typically it was the worst when decelerating through that rpm. I could hear it when accelerating through 2000rpm also but it wasn't as loud, probably because I didn't spend a lot of time in that range on acceleration.
I read just about every thread in the forum concerning exhaust drone and resonance but wasn't satisfied with doing nothing, or taking the new exhaust off and putting the stock exhaust back on; not after hearing what the Fabspeed put out.
I got under the car and looked around a bit and noticed that the pipe that bends into the muffler was butted up against the heat shield. After tapping around on the heat shield in that area, I figured that on deceleration, the exhaust would then vibrate causing the heat shield to vibrate as well. This is where all the noise was coming from. The pipes were touching the heat shield on both sides of the car.
I took a trip to Home Depot and bought a Flame Protector, found in the plumbing aisle. See picture. It cost about $15. It feels like heavy duty felt and it is good up to about 2500 degrees F. It also acts a great sound dampener. So, I cut a section of the flame protector to fit between the exhaust pipe and the heat shield. I didn't have much room in between, otherwise I would have doubled up the material on the left side. I had more room on the right side so I did double up there.
I took the car for a drive and voila. I can still feel a little resonance but I can't hear it anymore.
YOU CAN JUST FIRMLY PRESS IN THE AREA OF THE HEAT SHIELD AND DEFORM IT ABOUT AN INCH OR SO...IS IT SOFT THIN METAL.
Oops, just realized I wrote that in all caps...unintentional!
My exhaust pipe was pretty tight against the heat shield so the material stays put by itself. There was a small gap on the right side so I just doubled up the material. I am pretty excited about it not making that horrible noise anymore.
I just finished installing the fabspeed exhaust and it's pressed right up against the heat shield like yours. very frustrated and disappointed. mine will be going back to Fabspeed because this is not the "fit and finish" I was promised if this was the 299.99 china exhaust it would be expected but not for 2k do I expect this type of fit!
Thanks so much for this tip. I recently put on a Fabspeed maxflo exhaust too and the noise around 2200 RPM was horrible. I was almost at the point of going back to stock but this has saved the day! I couldn't find Oatey brand in Australia but instead used the Tradeflame Brazing Heat Mat which is good for 1000 degrees Celsius (1832°F). The carbon fibre felt is 6 mm thick so I triple folded on RHS (and doubled on the left). I also put one rivet through the felt and the heat-shield to hold it, although it probably wouldn't have fallen out without this.
This sounds like an annoying noise, to be sure. But let's all be very clear here: this is NOT drone. This is NOT the sound that most are complaining about between 2000 and 3000 rpm with their aftermarket exhausts. (To other users; If this is the sound you are experiencing, fix it, by all means. But don't muddy the waters by calling this "drone". It is not. )
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