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Brando
 
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custom exhaust for 930 with cat?

Anyone have any ideas/photos of a custom exhaust after turbo using a cat they fabbed up? I want to keep the exhaust together when it's time to test for emissions. I like the idea of a newer high flow cat and cheep muffler having someone or myself put it together. Thanks.
Brandon
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Turbo powa!
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Old 01-23-2008, 01:14 PM
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There was CA setups which would be easy to improve upon..
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Old 01-23-2008, 02:19 PM
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Brando
 
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What do you mean?
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Turbo powa!
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Old 01-23-2008, 02:40 PM
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Magnaflow or Borla XR-1 tubular (shown here) will fit, free flowing and 3" I/O.
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Old 01-23-2008, 03:37 PM
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Brando
 
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Thanks G, hows it sound? Looks good. Was it easy to fab?
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Turbo powa!
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Old 01-23-2008, 04:22 PM
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Quattrorunner,

I did something similar to pass emissions in Georgia four months ago and liked my set up so much I haven't replaced it. I welded a Magnaflow cat to a straight shot bullet muffler. The exit is to the right hand side as I didn't want to bother inserting a "U" turn. Then again my set up was replacing a dual outlet GHL so I already had an opening in the right valence.

It has a nice throaty sound and I took the opportunity to weld in a bung for a wideband O2 sensor for the Innovate A/F system. Also a nice addition to the car as it let me easily pass emissions testing.

The only outstanding change is to fabricate a new exhaust pipe for the wastegate. Just something to fill in the opening in the valence on the left side.
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Boost Addiction - honestly, I have it under control
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Mods include: Kokeln IC, GHL Headers, Hooligan muffler, Modified K27 7200, BL WUR, LC-1 & XD-16, Bilstein Sports (4), TRG sway bars, Oversize torsion bars, Strut brace
Old 01-23-2008, 05:03 PM
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Brando
 
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I had thought about that too. I like the simplicity there. Thanks
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Old 01-23-2008, 06:22 PM
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You should probably use a small dump pipe for your wastegate if your testing facility still puts the sniffer on the tail pipes. I used to have a matching wastegate dump pipe which I had to imagine skewed my test results when they stick the sniffer on it. Sure it doesn't release any exhaust normally but if they crank the car up enough to pop the wastegate you'll get a burst on un filtered exhaust running into the sniffer.

I ended up having a local muffler shop weld up a small cat and resonator (inline) to an exhuast flange in order to pass the test the last (and final time) that I needed to worry about this in Chicago. Real simple and cheap. I'll see if I can snap some pictures this weekend.
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Old 01-24-2008, 04:49 AM
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Brando
 
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Thanks that would be great.
That opens a new idea as well. If I had the dump pipe to match the other side, would it help me pass without a cat(or at least a lhollow cat)? Would the test work if it smelled nothing as in a dump pipe without the wastgate open at all or would it know it was not installed correctly? Thoughts ? Anyone understand the emissions testing machines?
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Turbo powa!
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Old 01-24-2008, 11:39 AM
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Brando
 
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Sure it doesn't release any exhaust normally but if they crank the car up enough to pop the wastegate you'll get a burst on un filtered exhaust running into the sniffer.

And maybe some flames
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Turbo powa!
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Old 01-24-2008, 11:41 AM
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How many cells do the Magnaflow Cats have? 100 or 200?
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Old 01-24-2008, 01:20 PM
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Crotchety Old Bastard
 
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Is this smog testing done on a dyno? Are they allowed to full throttle the car?
If so I would lock down the throttle to 1/3 to insure no boosting possible.
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Old 01-24-2008, 01:38 PM
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Brando
 
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Just a regular sniffing station. The only time they would do anything is to get to 25-2800rpm and thats it. No real need to boost at all.
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Turbo powa!
1977 911s. it's cool
Old 01-24-2008, 01:47 PM
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