duals
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Joined: Nov 2003
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From: Concord, New Hampshire
I have a summit cat back dual exhaust with 3" pipes and um no cats, its no 96 but it sounds cool, flowmaster and summit make them, not sure who else but there cheaper from summit but a slightly diffrent sound aswell.
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Joined: Oct 2002
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From: Montana
I have a true dual setup from the headers back. They both run down the passenger side, inorder to get around the gas tank. Duals after the cat will offer no performance improvements over a good single exhaust, except they may sound better and look good. Hope this helps
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Joined: Mar 2003
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From: Mobile, ALABAMA
ive got the same setup as you kev...but w/o the headers....it sounds alot better to me with duals rather than single muffler, i seem to have gained more hp with the setup..mabye its just me, maybe i think i want it to go faster 
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Joined: Nov 2003
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From: Concord, New Hampshire
After the cats will offer a slight improvment because of the lack of back pressure after the cats. is slight, like 5hp, but not a large diffrence, and there will be a noticable improvment in fuel milage, i have found this to be true on not just my truck but i put the summit exhause on a few of my friends trucks and the majority got about 1 to 2 miles better to the gallon.
CHRIS_CE yes on some obd II computers the check engin light will come on, i know cheyvy its 96 and up not sure about ford, but my trucks an 87, and it dosent have an ecm, its a carborated truck so it dosent know it has more power. and no cats.
CHRIS_CE yes on some obd II computers the check engin light will come on, i know cheyvy its 96 and up not sure about ford, but my trucks an 87, and it dosent have an ecm, its a carborated truck so it dosent know it has more power. and no cats.
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Joined: Oct 2002
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From: Montana
I have no problems with the computer on my truck and I have no cats. If you take the cats off You will run into problems if you have two oxygen sensors, one before the cat and one after. you won't have a problem if you don't change this. There are Oxygen sensor simulators that you put in place of the second sensor to keep the computer from setting a code.
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Joined: Feb 2003
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From: Illinois
you cant remove the cat without the check engline light coming on, on a 95 or 96 f series because there is 2 o2 sensors. 1 before the cat and 1 after. the 92-94s are ok, they only have the first sensor
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Posting Guru
Joined: Nov 2003
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From: Concord, New Hampshire
after one of the cats on one side i would assume, then run the other side sensor free thats how my friends chevy is that just had dual exhaust put on to clear the front driveshaft
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Joined: Mar 2003
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I have a 99F150 4.2 V6 I ran dual pipes straight off the cats (stock had 2 already with a collector for single muffler) and out the passenger side like the lighting. It sounds BAD ***!! I have noticed a decrease in power and an increase in gas guzzling. Although this could be because I like the way the engine sounds up around 4000 RPM. 
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Joined: Jul 2003
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From: irwin,pa
hp loss
Originally posted by ATC_250SX
thats weird ive never heard of a decrease in power, for some reason that dosent sound right.
thats weird ive never heard of a decrease in power, for some reason that dosent sound right.