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Booting the cat: Bad idea?
Hi all, I'm a long time reader who finally got bitten by the Porsche bug. (I'll provide some pics of my new baby when she's decent
 )Anyhow, what I believe to be the catalytic converter had a good hole blown in it. (I say "believe" because it's a Euro car and looked more like a muffler on the inside than a cat. Did Euro SC's even have cats? Nothing about it in the PO's import papers.) I whipped up a quick fix by getting the sucker cut out and having a pipe welded in it's place... effectively creating a bypass that looks much like the one sold by Pelican. (FYI, I'm exempt from emissions.) On to the questions: 1. Will this negatively affect the engine in any way? I know this supposedly gives a small performance boost, but I'm more interested in reliability for now. 2. What sort of effect does this have on the engine sound? The last time I heard another SC was very long ago, and I want the car to sound more or less stock. Being that the cat was bad from the get go, I really don’t have much to compare to. 3. Can someone tell me what a "Euro premuffler" is? I see it sold by several vendors... is it just a bypass shaped like a cat? Or is that what had blown on my car?  Big thanks!
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-- Alan '08 Porsche Cayenne S '78 Porsche 911SC Euro Coupe '02 Ford Think Neighbor '96 BMW 318ic Cabriolet |
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09-09-2004, 10:24 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,496
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Yes you had a premuffler on your car, not a cat. The premuffler is said to give a bit more HP than a bypass pipe such as what you replaced the premuffler with.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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09-09-2004, 10:26 AM
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Would you say it's worth the cash to replace it with a new premuffler? Or should I stick with my hack? The welds are rock solid and the whole thing looks like it'll keep together for a long time to come.
Thanks again.
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-- Alan '08 Porsche Cayenne S '78 Porsche 911SC Euro Coupe '02 Ford Think Neighbor '96 BMW 318ic Cabriolet |
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09-09-2004, 10:32 AM
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It's ok the way it is. I bet that if you put another premuffler on that you wouldn't feel the diffeence.
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Paul B. '91 964 3.3 Turbo Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb |
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09-09-2004, 11:03 AM
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Sounds good. What about reliability/engine sound? Any downgrade in the quality of either of those?
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-- Alan '08 Porsche Cayenne S '78 Porsche 911SC Euro Coupe '02 Ford Think Neighbor '96 BMW 318ic Cabriolet |
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09-09-2004, 11:27 AM
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Slippery Slope Victim
Join Date: Oct 2001
Location: Brooklyn, NY USA
Posts: 4,391
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Hey BrooklynBound.......why don't you come by and check out my setup. SS Dansk premuffler (thanks Kurt) and Dansk 1 in 1 out SS sport muffler. Send me a PM and we'll conversate.......is that a word?
Any way....where in beautiful (fourth largest city) Brooklyn are ya? Mike²
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Mike² 1985 M491 |
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09-09-2004, 04:49 PM
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Mike: Sent you a PM.
I'm in beautiful Coney Island... home of Nathans, the Cyclone, Astroland, and much more. Who else is in Brooklyn? Or NY Metro for that matter?
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-- Alan '08 Porsche Cayenne S '78 Porsche 911SC Euro Coupe '02 Ford Think Neighbor '96 BMW 318ic Cabriolet |
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09-14-2004, 10:43 AM
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Join Date: Nov 2003
Location: Worcestershire. England
Posts: 291
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Don't forget the Warriors! lol
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"Understeer is the sign of the Devil" 1989 911 Carrera Targa (Black) 2001 Jaguar XKR (Silver) |
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09-14-2004, 10:58 AM
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1991 Porsche 964 Turbo
