[s-cars] Stromung questions, specifically cats vs straight pipe

[Taka Mizutani]

James-
I don't know how different Gen 2 was vs. Gen 1, but I had the Gen 1
(had the bigger resonator, definitely not a Borla XR-1). The drone was
bad between about 2400-3100rpm.

I got a Gen 3 rear section from Scott at Stromung- pretty much
eliminated the drone. This was in a '91 200q, so your S6 should be a
lot better- much more sound insulation. I've been in S cars with the
Gen 3 and it's really nice and quiet, no drone.

The cat will reduce noise levels, but will not kill the drone- the Gen
3 bigger rear muffler really helped in that regard.

Taka


On Sun, 27 Mar 2005 21:25:02 -0600, James Bowes <thermobob at hotmail.com> wrote:
> Real quick background, just installed my Gen 2 Stromung on my 95.5 S6 Avant.
> Workmanship was awesome. I have the smaller center resonator and am running
> the straight pipe, and the noise is really bad. It's what I believe is
> referred to as 'droning'. Pretty much at all speeds/rpm's. Seems to be in
> mostly the midrange. I have the Magnaflow resonator that Stromung sent out
> to address this issue, and I'm having it welded into place tomorrow after
> work. I hope this solves the 'buzzing', as I sound like a damn rice-boy.
> 
> Anyways, here's my question... What will installing the cat converter in
> place of the straight pipe yield in terms of performance and sound? Yes yes
> yes I'm concerned about the environment, so we'll leave that out of it for
> now please. First off, how much does the cat help with the noise level, and
> which frequencies would see the most dampening? Second, does the cat affect
> the performance much? How so?
> 
> I'm tempted to leave the straight pipe in and get the new resonator, but
> I've spent a lot of time rolling around under the car this weekend and I
> want to be done with it. Fiancee is getting pissed.
> 
> Thx in advance
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