Converting to Dual Exhaust
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Joined: Jun 2004
Posts: 78
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From: Olympia wa
Converting to Dual Exhaust
[FONT=Comic Sans MS] I need advice. If I replace the stock system on my 87, do I have to replace the cats. The systems I've seen at several sites have spaces left where the pre-cats are now, but I would rather not put them back in. (we don't have emissions tests here) How do you plumb the sensors? Would this upset the ECM? Any help would be appreciated.[COLOR=RoyalBlue] : 
Burning Brakes
Joined: Jul 2004
Posts: 956
Likes: 0
From: Mesquite Nevada
While I was living in Hawaii, I ran mine without the cat or precats -- car ran great. When I received my orders to Utah and found out they had pretty strict emission and safety inspections, I put the cat back on, but not the pre's -- no problems (with the car or inspections) 
Drifting
Joined: Apr 2003
Posts: 1,379
Likes: 4
From: rome ny
mid america has a true dual convertion but its only 2 1/4 inch pipe. i ran this for a few months and didnt like it. if you decide to go duals you will want to run an x-pipe to balance exhaust. it will sound and perform better.
for performance purposes you are better off going with headers into y- pipe and a nice cat back system.
for performance purposes you are better off going with headers into y- pipe and a nice cat back system.
