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Old 12-27-2005, 03:43 PM #1
paintballguy990 (Banned)
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grr exaust

got an offroad X pipe from BBK and flowmaster catback for my car, when I put on the new x pipe will I need something to replace the O2 sensors? if I just put it on will it make my car run wrong from not enough back pressure? or can I just put it on and turn on a light and not worry about it?
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Old 12-27-2005, 04:05 PM #2
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You'll want to put the O2 Sensors back in so that they can still correct for long term fuel trims and give you better mileage as you cruise. It will throw a light, but you'll live to ignore it like I have. Should have no real issues from putting it in.
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Old 12-27-2005, 04:08 PM #3
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you can reuse the o2 sensors?
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Old 12-27-2005, 04:13 PM #4
blue69camaro383 (Banned)
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i've noticed fox bodies computers tend to "learn" after awhile...just replace the sensors and drive...it will run like *** maybe but after a few miles it should be fine
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Old 12-27-2005, 04:30 PM #5
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Quote:
Originally Posted by blue69camaro383
i've noticed fox bodies computers tend to "learn" after awhile...just replace the sensors and drive...it will run like *** maybe but after a few miles it should be fine
when they unplugged the battery in my car to clear the light, because my comp. is so old they don't clear themselves. It ran like hell for a day but it learned everything all over again. I'd recommend remounting the sensors. Depending on how bad it runs without the sensors you might end up saving money in the long run.
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Old 12-27-2005, 05:06 PM #6
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No problems running an offroad X on my 91. I only have 1 o2 sensor in because we destroyed the other trying to get it out of the stock crossover pipe. Oh well.
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Old 12-27-2005, 11:56 PM #7
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it runs fine with just 1 o2 sensor in it?
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Old 12-28-2005, 12:45 AM #8
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Lightbulb

When you put just the x pipe without catback? I don't think it will be that detremental, although I did run open headers when I first installed them. The O2 sensors went crazy, and my LT1 kept shutting off. Gas milage was shyte of course. They do make O2 sensor simulators though.
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Old 12-28-2005, 05:07 AM #9
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If you're going to the trouble of an x-pipe, do a true dual exhaust. Going through a catback would just be like a y-pipe. Also, flowmaster catbacks have some of the worst flow. (though they sound good) As far as your O2 issue, you just need some O2 simulators. They tell the computer everything is A-OK.
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Old 12-28-2005, 11:28 AM #10
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research on the flowmaster comment? I heard nothing but good things about the flowmaster thunder series. I was even turned off from Borla.
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Old 12-28-2005, 12:57 PM #11
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http://www.ls1tech.com/forums/showth...ght=flowmaster

http://www.ls1tech.com/forums/showth...ght=flowmaster

I could probably dig up more of the same - other people's views on the flowmaster catback. You're either going to listen to them or not, so w/e. Don't get me wrong, flowmaster makes other good products, but it seems like their catback would be worth shying away from when there are others out there that are affordable and better performing.

Now, all I have info on is relating to what would go onto a 4th gen f-body since what I drive is a 99 z28. Results may be different for other cars.

But really though - if you have an X-pipe going into a catback, you just turned it back into a Y-pipe. I mean, that's what catback commonly refers to. If you're talking about adding flowmaster mufflers to do a true dual setup, that's a completely different story. If that's the case then flowmaster might be just fine. I haven't looked into their plain mufflers. But you will confuse whatever shop if that's what you're looking for and you call it a cat-back. True dual will have the best performance, so I'd highly suggest doing that if you thinking the cat-back was what you wanted.

As far as alternate catback, based on other people's reviews and cost, I'd suggest a Hooker cat-back.

And since I don't see it mentioned, what sort of car is this for?
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Old 12-28-2005, 01:28 PM #12
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dude u dont understand what a catback is.

you have essentially 3 parts to my exaust. The headers, the midpipe (x pipe), and the cat back. The stock X pipe has 4 cats on it then it splits into the catback which runs to the back of the car. The catback is pretty much just a 2.5 inch diamater tube that has mufflers at the end.
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Old 12-28-2005, 01:59 PM #13
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Since my experience is more or less limited to 4th gen fbodies, and since you didn't say what kind of car you had, how am I supposed to know what defines a cat-back for your car? With an LS1 if someone gets an Xpipe, they're replacing a stock Y, so, a catback in regards to 4th gen f-bodies definitively means something that's going to get stuck on a y pipe. Different things for different people. Since pretty much everything I said about the flowmaster may very well not apply to your car, just ignore it.

The O2 sims though are still valid - that's what you need to keep your computer happy. Now if you have to deal with emissions and this is not an OBDII car, then you might be screwed with the ORX. If it does have OBDII then you'll be fine since they won't use a sniffer. Unless you're in Cali, in which case the emissions nazis will bend you over.

So, what kind of car is it?
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Old 12-28-2005, 04:20 PM #14
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fox bodies are true duals from the factory...they are not gay like f body exhaust...
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Old 12-28-2005, 07:33 PM #15
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i figured everyone knew what I had..1990 fox body 5.0 mustang GT.
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