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Registered
Join Date: Sep 2000
Location: Shreveport, La.
Posts: 1,710
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Cat Gut Testimony
Spent the morning gutting the old Cat. If you haven't done it yet, do it today!! Noticeable improvement in acceleration. After a very Spirited run, temp below first bar. Used to run about 9 oclock after normal driving. Now for that performance muffler. BTW car sounds incredible without muffler.
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Robert Stoll 83 911 SC 83 944 |
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11-10-2001, 08:38 AM
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Join Date: Sep 1999
Location: Reston, VA
Posts: 376
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Hey Robert - now you know why many of us go to SSI headers and a dual-in muffler - - pipes from the heater boxes straight back to the muffler! No Cat. performance is significantly improved on World-Dominating SCs!
 - Chuck 83SC |
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11-10-2001, 09:53 AM
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Join Date: Sep 2000
Location: Shreveport, La.
Posts: 1,710
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Yeah Chuck, the car revved like it didnt have a flywheel on it with the muffler off. Got to get a Bursche or Ansa with two outlets next.
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Robert Stoll 83 911 SC 83 944 |
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11-10-2001, 11:33 AM
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Join Date: Jan 2001
Location: Iowa
Posts: 1,020
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How _do_ you gut an old cat? Is it reusable after gutting?
I have noticed that cat bypass pipes are quite cheap ($130). Do they have a screw hole for the O2 sensor? Some time ago I recall seeing posts suggesting that some free flow mufflers can actually reduce performance. Is this because they somehow create more backpressure, or is it that the reduced back pressure 'confuses' the DME? If the latter, could not a cat bypass do the same, since I would assume that it also reduces back pressure?
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John C 1988 911 Carrera coupe 2002 BMW 530 |
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11-10-2001, 01:22 PM
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Join Date: Sep 2000
Location: Shreveport, La.
Posts: 1,710
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I used Superman's "broomstick" method. Remove muffler and valance, insert broomstick, rap with hammer until ceramic catalyst shatters, start engine blow out chunks, reinsert broom stick...repeat until clear. Result, cooler, stronger running engine. See "bucket o guts".
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Robert Stoll 83 911 SC 83 944 |
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11-10-2001, 01:27 PM
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Senior Member
Join Date: Jan 2001
Location: Left Coast, Canada
Posts: 4,572
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Shame on you, Robert, I never thought you'd be cruel to animals. Was your cat dead? Why didn't you put it on the shelf for a future smog-nazi attack? You could have bought a test pipe for $100 or less. A new cat will set you back 5x that.
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'81 SC Coupe "Blue Bomber" "Keep your eyes on the road, and your hands upon the wheel."- J.D.M. |
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11-10-2001, 01:59 PM
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