Re: 2001 QC 4.7 and Custom Dual Cat-Back Exhaust

From: SEMIHEMI01@aol.com
Date: Mon Apr 30 2001 - 16:58:51 EDT


Paul,
    3" duels will cost you in bottom end torque. 3" single is an advantage
tough. If you make a set of duels DO NOT go over 2-1/2" on each side. Causes
cats to do crazy things a confuses PCM because the cats are not doing their
thing and the O2's know it.... leads to loss of torque. Make sense? Didn't
to me either. But basically the cats need a certain amount of back pressure
to function within the guidelines in the PCM. Bill

SEMIHEMI01@AOL.COM (Bill C.) 2001 QC, 4.7L, KENNE BELL SC'ed, 5spd.
3.55 LSD, Bored & polished TB, 10w-30 MOBIL 1, GIBSON 3" Single <A
HREF="http://hometown.aol.com/semihemi01/">"THE DAK"</A>



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