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Old 05-01-2019, 07:08 PM   #1
Jim @ 928 Classics
 
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aftermarket muffler drone, returning to stock

Hi Eveyone, lurker with my first thread here... 97 Boxster, 5 speed

Aftermarket exhaust w/equal-length headers, high-flow cats, twin tip muffler. Don't know the mfg, but the quality is decent.
However, bad exhaust drone due the muffler design.
Would like to return to stock starting with the muffler, have a couple questions...

What is the distance inlet to inlet on the stock rear muffler?
Trying to gauge if I can fit the stock muffler to the existing setup.
For reference, the distance on the aftermarket muffler is approx 28".

Lastly, is the 2.7L or 3.2L rear muffler a better choice compared to the 2.5L?
From what I've read it appears so, but I'm not understanding why they might be better.

Thanks in advance!

Loving my Boxster.










Last edited by jadz928; 05-31-2019 at 05:48 AM. Reason: fixed oversize pics
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Old 05-01-2019, 08:17 PM   #2
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My suggestion is to just go 100% stock. Otherwise you may have issues, if you want more sound (originals from the first gen are lacking in the flat 6 sound department) you could spring for fsbspeed, porsche sport exhaust, or akrapovic.
Just my opinion though.

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Old 05-02-2019, 08:30 AM   #3
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I just installed a fvd brombacher sound version muffler. No drone 2k rpm its 88db in a closed garage at 4k 99 to 100 ish.

Sounds great.
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Old 05-03-2019, 06:24 AM   #4
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Thanks for the feedback! I think I'm somewhere in the middle of both recommends right now.
Plan is to incrementally return to stock, and I'll start with the muffler.

So I'm thinking the stock muffler is wider, and that I'll need the stock inlet tubes to mate up with the aftermarket cats.
The cats appear to mounted and exit similarly to stock, so it might just work out.

Right now, I'm targeting the 2.7L muffler and hanger setup. If it ends up being too quiet, I may add the 'sport exhaust' bypass mod.

Main priority at the moment is to loose the drone.
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Old 05-03-2019, 06:45 AM   #5
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I have installed muffler inserts into the outlet tips to dramatically reduce drone .
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Old 05-03-2019, 07:20 AM   #6
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If you have sport cats you might want to keep those, helps the motor breath.
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Old 05-03-2019, 11:17 AM   #7
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Quote:
Originally Posted by Cunningr View Post
I just installed a fvd brombacher sound version muffler. No drone 2k rpm its 88db in a closed garage at 4k 99 to 100 ish.

Sounds great.
I've had the FVD Brombacher sound version for many years, with cat delete pipes for a couple years. Awesome sound with zero drone, but around $1k.
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Old 05-03-2019, 12:05 PM   #8
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What are muffler inserts?
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Old 05-03-2019, 12:26 PM   #9
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Muffler inserts or exhaust inserts are generally perforated tubes with some type of washer or flange at one end to hold it in place . As an example look up Car Chemistry but there are many brands and styles .
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Old 05-03-2019, 12:38 PM   #10
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Quote:
Originally Posted by MN 986 View Post
I've had the FVD Brombacher sound version for many years, with cat delete pipes for a couple years. Awesome sound with zero drone, but around $1k.
+1 on the FVD Brombacher

I had one on the 987CS and it sounded great with 0 drone... but sold it, because it didn't fit on the 981CS

Note: I actually had the SpeedArt (from the same company that manufactures the FVD)
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Old 05-03-2019, 02:07 PM   #11
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+2

FVD Brombacher.

I love mine.

Priceless.
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Old 05-03-2019, 02:40 PM   #12
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Quote:
Originally Posted by MN 986 View Post
I've had the FVD Brombacher sound version for many years, with cat delete pipes for a couple years. Awesome sound with zero drone, but around $1k.
I too have this system. Love it! No drone and sounds great

The only issue I see is that you have a lot of rust under there. It is not going to come apart easily. Lots of PB Blaster.... LOTS!
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Old 05-03-2019, 02:44 PM   #13
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Yeah I'm thinking he might need new clamps and hardware.
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Old 05-30-2019, 02:31 PM   #14
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Finally finished the muffler, sorry for the delay.

Decided to use an OE muffler, 2.7L from a '02. Kept the headers and hi-flo cats for now.

Required a bit of work the mate with the stock muffler and hardware. Happy with how it turned out.

Sound is very good at idle, and with revs. Will report back with road sound and drone (hopefully the lack of).

All in, about $250 for the muffler and hardware needed to mount the later hanger system to the '97.




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