Catalytic converter placement?

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Aug 5, 2004 | 02:28 PM

DirtyRed

Thread Starter

Instructor

Joined: Jun 2004

Posts: 203

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From: CA

Catalytic converter placement?

I recently bought the LG exhaust system. The instructions that came with the kit were minimal. On the stock system the cats are placed just aft of the exhaust manifolds. In the photos of the LG's they're placed downstream of the X-pipe.
My question is, don't the cats have to reach a certain temp to work? Is placement in the system a concern? Would placing them in the stock loc before the x-pipe hurt performance?

Aug 5, 2004 | 03:05 PM

TIKTGTR

Melting Slicks

Joined: Oct 2002

Posts: 2,151

Likes: 1

From: N.CHARLESTON SC

How about the trash can?

Just kidding!! I see you live in California so you have to keep them.

I'm sure someone will chime in with some useful info though

Aug 5, 2004 | 05:14 PM

BHP

Le Mans Master

Joined: Jul 2002

Posts: 7,076

Likes: 26

From: Nevada and Florida

You want them close to header for the best "light-off."
The LG system is illegal at the federal and Republik of Kalifornia.

Aug 5, 2004 | 05:18 PM

c5chris

Le Mans Master

Joined: Dec 2001

Posts: 5,761

Likes: 1

From: Irvine CA

Quote:

Originally Posted by BHP

You want them close to header for the best "light-off."
The LG system is illegal at the federal and Republik of Kalifornia.

I think every Longtube system is illegal in California since all of them require taking off precats.

Aug 5, 2004 | 06:32 PM

MikeJamesC5

Burning Brakes

Joined: Nov 2003

Posts: 1,120

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From: Ypsilanti MI

I plan on getting the LG LT Headers minus cats. I guess Michigan is thinking about passing a emissions law here in the next year but oh well.

Aug 5, 2004 | 06:46 PM

sweetcharity

Safety Car

Joined: Jul 2002

Posts: 3,874

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From: Fishing Somewhere Cold

St. Jude Donor '11-'12-'13, '15

The Random Tech. Cats require only 140 degrees to work properly! With that you can place them behind the X pipe as Lou himself recommends. Myself I put them in up front before knowing this and left them there cuz I did not want to take the stuff apart again!!!