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Registered
Join Date: Oct 2003
Posts: 11
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test pipes
I have 87 911(stock) and want more oomph. can anyone give me some feedback on whether or not I should install a cat bypass test pipe. emmissions not an issue in my area. Is their noticeable power improvement and/or any drawbacks?? thanks
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10-03-2003, 04:32 AM
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Registered
Join Date: Sep 2001
Location: Kerrville, Texas
Posts: 1,021
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I installed one several years ago for two reasons. One is its hot here in Houston and removing the cat I feel lowered the heat on that side of the engine. Two is its cheap and I was curious. I'm not sure it added anything other than a deeper exhaust tone which I like. My 1987 has a mass flow sensor so maybe the bypass helped but I couldn't tell. One draw back is Houston raised the emission test hurdle and I cannot pass it without the cat so it goes back on once a year. Previously I could pass easily without it. A testament to the efficiency of the engine especially since it has well over 130,000 miles on it.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not. 2012 BMW 528i (wife's) 2007 Toyota FJ (rain and off road days) |
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10-03-2003, 06:02 AM
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Join Date: May 2002
Location: Indiana
Posts: 4,553
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I have heard the premuffler adds horsepower and the bypass doesn't. I dont have any proof one way or the other. I just hollowed out the cat. It sounds better but cant feel any power increase. No emmisions worries here either.
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Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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10-03-2003, 06:12 AM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 55,810
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Quote:
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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10-03-2003, 08:23 AM
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Join Date: Feb 2002
Posts: 667
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I have an 82 SC. I do not know if the test pipe gave any increase in HP but it seems to have a little better throttle response. That could be in my head, but who cares. I believe. It sounds good and runs a little cooler, which is important here in South Carolina, where it gets real hot.
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10-03-2003, 09:54 AM
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Join Date: Nov 2000
Location: Ashburn VA.
Posts: 667
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Been there done that. Dont waste your money on a test pipe, it only lowers the temperature around the left valve cover.
I now have the Fabspeed pre-muffler, it gives you a lot better torque at a low RMP.
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George My Owners Gallery Page 1983 911SC - Built July 1983 #2547 out of a total 2559 shiped to the US. in 1983. Could be the last U.S. production SC still running. 1995 BMW 525I 2001 Highlander- kid mover |
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10-03-2003, 12:08 PM
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