Cat Question

victor · 11-20-2006, 07:01 PM

I know the R18 has 2 cats. One right where the header is at and another one under the car. If you were to replace the second one with just a straight.
a.) Would the car get louder?
b.) Will you gain HP?
c.) Will you loose LOW END TORQUE?

civicowner · 11-20-2006, 08:09 PM

you will loose backpressure, thus torque in some areas, midrange if i am not mistaken.

smp06si · 11-20-2006, 08:32 PM

I have an SI and I'm cat-less. I actually noticed a gain but only reason is because I'm boosted. If your n/a keep your cat.

fa1 · 11-20-2006, 09:20 PM

Where did you hear that the R18 has two cats? It has only one, the one in the engine bay. You may be thinking of the resonator instead of the cat.

victor · 11-21-2006, 01:21 AM

Quote:

Originally Posted by fa1

Where did you hear that the R18 has two cats? It has only one, the one in the engine bay. You may be thinking of the resonator instead of the cat.

oh yah i guess the resonator, if i was to take that thing out, will i gain any hp? how much louder will it be?

fa1 · 11-21-2006, 02:05 AM

Quote:

Originally Posted by victor

oh yah i guess the resonator, if i was to take that thing out, will i gain any hp? how much louder will it be?

The stock resonator is welded onto the mid-pipe. You will need to saw it off and weld a new pipe on, or patch the stock one. Without a resonator you may gain a little more top end hp (but may also lose some low end torque<<unsure if it will happen;hasn't been tested on R18 motor yet) And yea it will be loud and most likely have a raspy sound. I would suggest you wait till a proper catback exhaust comes out for the R18 or you can get the magnaflow one now.

dannn · 11-21-2006, 02:28 AM

taking off the resonator will make your car louder

11-20-2006, 07:01 PM	#1 (permalink)
victor Senior Member Join Date: Aug 2006 Posts: 475 iTrader: 1 / 100%	Cat Question I know the R18 has 2 cats. One right where the header is at and another one under the car. If you were to replace the second one with just a straight. a.) Would the car get louder? b.) Will you gain HP? c.) Will you loose LOW END TORQUE?

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11-20-2006, 08:09 PM	#2 (permalink)
civicowner Senior Member Join Date: Oct 2006 Location: california Posts: 305 iTrader: 0 / 0%	you will loose backpressure, thus torque in some areas, midrange if i am not mistaken.

11-20-2006, 08:32 PM	#3 (permalink)
smp06si Senior Member Join Date: May 2006 Location: Shreveport, LA Age: 22 Posts: 182 iTrader: 1 / 100%	I have an SI and I'm cat-less. I actually noticed a gain but only reason is because I'm boosted. If your n/a keep your cat.

11-20-2006, 09:20 PM	#4 (permalink)
fa1 Senior Member Join Date: May 2006 Location: SF, CA Age: 19 Posts: 2,418 FA Squad Member #17 iTrader: 1 / 100%	Where did you hear that the R18 has two cats? It has only one, the one in the engine bay. You may be thinking of the resonator instead of the cat.

11-21-2006, 02:28 AM	#7 (permalink)
dannn Senior Member Join Date: Nov 2006 Posts: 520 iTrader: 0 / 0%	taking off the resonator will make your car louder