02-22-2007, 11:25 AM
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Registered User
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Join Date: Aug 2003
Location: Wichita, KS
Posts: 100
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Do aftermarket headers replace cats?
Just wondering for SCCA reasons. Can't seem to find the right search terms.
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02-22-2007, 12:04 PM
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but this one goes to 11..
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Join Date: Jul 2006
Location: Alfaville
Posts: 2,201
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Cats
 Quote:
Originally Posted by RogerB
Just wondering for SCCA reasons. Can't seem to find the right search terms.
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__________________
currently: 1984 GTV6 (Sabrina) 1992 164L (Jill) 1992 164S (Kelly) 1989 Spider Veloce (Julie)
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02-22-2007, 12:15 PM
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Registered User
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Join Date: Aug 2003
Location: Wichita, KS
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Quote:
Originally Posted by AlfaTango1
If you're racing you can just skip the cat alltogether with or without headers.
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Example: My Contour has one "pre-cat" for each bank, plus a main cat. Headers delete the pre-cats, so they are a no-go for that car unless I go to Street Prepared.
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02-22-2007, 02:28 PM
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but this one goes to 11..
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Join Date: Jul 2006
Location: Alfaville
Posts: 2,201
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Which Alfa do you plan on running?
__________________
currently: 1984 GTV6 (Sabrina) 1992 164L (Jill) 1992 164S (Kelly) 1989 Spider Veloce (Julie)
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02-22-2007, 03:05 PM
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Registered User
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Join Date: Aug 2003
Location: Wichita, KS
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Quote:
Originally Posted by AlfaTango1
Which Alfa do you plan on running?
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02-22-2007, 05:11 PM
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but this one goes to 11..
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Join Date: Jul 2006
Location: Alfaville
Posts: 2,201
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Cats
Quote:
Originally Posted by RogerB
Looking at Milanos.
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__________________
currently: 1984 GTV6 (Sabrina) 1992 164L (Jill) 1992 164S (Kelly) 1989 Spider Veloce (Julie)
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02-22-2007, 05:33 PM
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George Schweikle
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Join Date: Jan 2004
Location: Lexington, KY
Posts: 1,700
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Hi RogerB,
Looking at the 2007 SCCA Solo rule book, class STS:
"Exhaust manifolds and headers may be replaced with alternate units which are emissions-legal"....This allowance does not permit relocation of the catalytic convertor..."
My take on this is that you could use headers, but would need to connect to a stock Milano Cat. Further, I wonder if "Emissions-legal" means you would need a California CARB approval for the headers.
Whatever... get the car ready and join me at the Solo Nationals next fall. Topeka isn't that far from your location.
__________________
George Schweikle
1976 Spider (Dedicated Autocrosser, "SPICA, No Carbs")
1991 Spider Veloce (Retirement cruiser)
Scuderia Non Originale
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02-22-2007, 05:34 PM
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Registered User
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Join Date: Dec 2002
Location: Colorado
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The old Shankle headers included a Y-pipe to be welded to the front of the stock catalytic convertor.
Most other headers, such as CSC, Vick's, and IAP do not include any provisions to use the original catalytic convertor but could easily be set up to use a cat by an exhaust shop.
Some areas are picky about the number of cats - i.e. it may not be legal (for smog or your racing/autocross class) to replace a single cat with duals, etc.
Joe
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02-23-2007, 07:13 AM
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Location: Wichita, KS
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Quote:
Originally Posted by JoeCab
The old Shankle headers included a Y-pipe to be welded to the front of the stock catalytic convertor.
Most other headers, such as CSC, Vick's, and IAP do not include any provisions to use the original catalytic convertor but could easily be set up to use a cat by an exhaust shop.
Some areas are picky about the number of cats - i.e. it may not be legal (for smog or your racing/autocross class) to replace a single cat with duals, etc.
Joe
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STS rules restrict you to the OEM cat(s) in their stock locations.
Again, on my Contour (which has 3 cats), my only allowance besides a cat-back is to alter the Y-pipe between the "pre-cats" and the "main."
Are the shankle headers dead? What about "SZ" headers, or is that the same thing?
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02-23-2007, 07:30 AM
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but this one goes to 11..
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Join Date: Jul 2006
Location: Alfaville
Posts: 2,201
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Milanos have a single cat.
__________________
currently: 1984 GTV6 (Sabrina) 1992 164L (Jill) 1992 164S (Kelly) 1989 Spider Veloce (Julie)
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02-23-2007, 07:57 AM
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Registered User
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Join Date: Dec 2002
Location: Colorado
Posts: 3,024
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Quote:
Originally Posted by RogerB
Are the shankle headers dead? What about "SZ" headers, or is that the same thing?
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The "SZ" headers were and OEM part for the ES30 Alfa "SZ" and "RZ" cars of the early 90s. They are a bit different in that they are "shorty" headers that only replace the cast manifold and not the downpipes. You could easily fabricate a way to mate these to the OEM downpipes and cat. The main problem would be finding a set, they are no longer available through Alfa.
Joe
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