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Registered
Join Date: May 2005
Location: Connecticut
Posts: 1,484
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For anybody with an aftermarket cat...
I have a crappy Midas cat that the first owner installed on my car. It's nowhere near the size of the 944 cat, it was welded on, the outlet pipe doesn't fit snug against the tailpipe, etc...
I picked up a good used OEM 944 manifold and cat assembly, because I don't feel the need to invest in a new converter just yet, and I don't want to go researching performance cats. Seeing as how I have to pull the head, (and it was burning coolant) it's an ideal time to change the cat. Right now, it doesn't sound as aggressive as other 944s I've heard, and I attribute it to the cat being a bit small and possibly restricted. It's also a bit boomy when climbing a hill. Will a change affect the exhaust tone? I really like the engine note, particularly the hint of belt whine. Sometimes I feel like the exhaust takes away from it, rather than complementing it. |
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09-29-2005, 08:09 AM
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Writer/Teacher
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why not just have a straight pipe fabricated to replace the cat?
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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09-29-2005, 08:37 AM
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Join Date: Dec 2004
Location: Harrisonburg, Alexandria, Va.
Posts: 465
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Other 944's probably sound more boomy because after 20 years the cats are empty.
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'91 Jeep Cherokee 4.0L HO - Daily driver '83 Callaway 944 2.5L turbo - Soon to be daily driver '83 Porsche 944 NA - sold '78 Porsche 924 NA- RIP '89 Porsche 944 S2 - Parted Looking for a nice 944S for a daily driver. |
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09-29-2005, 08:44 AM
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Registered
Join Date: May 2005
Location: Connecticut
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The straight pipe would get me in trouble. When I brought it in for emissions, the man checked with a mirror for the cat. He had a hard time finding it, until I told him it ran down the middle of the car. At that point, I assume he just pretended to find it; he didn't look too hard.
Plus, it failed emissions for CO. I don't know if I need to make it worse, though having the engine not burn coolant might go a long way towards that goal. At any rate, $30 for used headers and a cat isn't too bad. I also have to decide on whether I want to keep my early iron headers, or install the lighter steel ones in that supposedly crack. |
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09-29-2005, 10:41 AM
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The reason why the stock 944 cat is big is beacuse only half of it is the cat the other half is a resinator, all the after market ones are small cus its just the cat. Thats also the reason why it might sound a little different. Also u should first fix any problems you have (like burning coolant) before you go to emission, This way it would be alot easier to trouble shoot the CO problem. Also since u have been burning coolant I would replace the plugs and the 02 sensor
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1986 951, Stock for now. ]87 924S Gaurds red- SOLD after 11 years of ownership |
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09-29-2005, 01:05 PM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
1987 Porsche 924S 2.5 modified
