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Old 08-10-2002, 05:48 PM   #1
2.5racer
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Join Date: Nov 2001
Location: Lakewood, Co
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2000 RS w/ej20 & e85
94 RX-7 1/2bridge w/meth

Default no cat. how get rid of cel

I am making a 2.5" track pipe. I don't want the cel to come on cause at the track I would rather it came on with a real problem. the pipe bolts from the header and goes all the way back (I might add a muffler cause I don't want to get pulled over on the way to the track (300 mile drive). We don't have smog laws but noise laws do come into effect. ummm oh yea does anyone know if a straight 2.5" will have enough back pressure cause I heard that na motors need some back pressure.
also I want to make a daily driven pipe and I wan't a deep boxer sound what would create this (not a raspy "thhhhh" rice sound) i've heard a 3" n/a (he just added a turbo) and it made a deep sound but it had wierd pulses (this was on an eclipse) I want a deep solid sound.
sorry I tend to type alot.
thanks for any help.
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Old 08-10-2002, 07:35 PM   #2
Patrick Olsen
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Default Re: no cat. how get rid of cel

Quote:
Originally posted by 2.5racer
We don't have smog laws
Sure you do, it's called Federal Law. Your state might not have an emissions testing program, but you are still required by Federal Law to have a fully functioning emissions system on your car. My guess is you'll pick up a grand total of 2 or 3hp over what you would get if you just used a hi-flow cat in place of the restrictive stock cats.

Quote:
Originally posted by 2.5racer
ummm oh yea does anyone know if a straight 2.5" will have enough back pressure cause I heard that na motors need some back pressure.
If this is for a real track (in other words, a road course) then you don't need to worry about any loss of low end torque you might experience as a result of the reduced backpressure. You'll be at high RPMs all the time, and at those RPMs the extra breathing ability of the more open exhaust will be a good thing.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 08-10-2002, 07:44 PM   #3
subachad
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1993 Impreza GCStyle
Teal

Default Re: no cat. how get rid of cel

Quote:
Originally posted by 2.5racer
ummm oh yea does anyone know if a straight 2.5" will have enough back pressure cause I heard that na motors need some back pressure.


That's a bit of a Myth. Backpressure itself is bad. Exhaust velocity is good. If you get too large of a pipe, you can lose some of the exhaust velocity which helps in "sucking" out the exhaust from the motor. With a good exhaust, you can feel it from about 2feet behind the car with the car idleing.

Almost forgot. You can get rid of the CEL if you get some sort of MIL eliminator. Do a search on google and you'll come up with a few.

Chad
93 1.8T
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Old 08-10-2002, 07:58 PM   #4
2.5racer
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Default

thanks for clearing up some things (I might just get a hiflow cat and not worry about the cel thing) but does anyone know how to get a deep rumble I don't want raspy, if you know what I mean.
and it's for drag track although there are a few auto-x that take place near here, and I am planning on visiting my friend and hitting laguna seca later this summer.
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