disadvantages of going catless

[RAZR]

im gunna need a new exhaust nose to tail so i wanted to ask what are the pros and cons of going catless?
and anyother tips i should know?

[Tdurr]

emissions. besides that, none.

[RAZR]

emissions. besides that, none.

i dont have emissions in IL

will it make my exhaust like a million times louder on this car?

i also remember seeing on this site that 2.5 in exhaust is perfect for this motor is that correct??

[lostforawhile]

I just built an entire system out of 2 inch, you don't want to go to big or you will lose exhaust velocity and scavenging. even this new S&S header uses 2 inch pipe after the collector

[RAZR]

I just built an entire system out of 2 inch, you don't want to go to big or you will lose exhaust velocity and scavenging. even this new S&S header uses 2 inch pipe after the collector

so what ur saying is that i should go 2in pipe for best results?

[lostforawhile]

so what ur saying is that i should go 2in pipe for best results?

it's debatable, some say 2.5 some say 2, everything i've seen says a 2 inch system is good for this displacement engine, it also depends on what kinds of bends you use, if you use crimped over bends, like most exhaust shops do, you might go to 2 and a half, because you will have restrictions in the bends, I used mandrel bends so I don't have to take that into account

[RAZR]

it's debatable, some say 2.5 some say 2, everything i've seen says a 2 inch system is good for this displacement engine, it also depends on what kinds of bends you use, if you use crimped over bends, like most exhaust shops do, you might go to 2 and a half, because you will have restrictions in the bends, I used mandrel bends so I don't have to take that into account

so in ur opinion should i go catless?? or get a high flow cat?
or just keep the stock one?

[lostforawhile]

so in ur opinion should i go catless?? or get a high flow cat?
or just keep the stock one?

thats up to you, if you decide to keep it, definitely go with a high flow cat, i'm sure the stock one is pretty restricted by now

[RAZR]

thats up to you, if you decide to keep it, definitely go with a high flow cat, i'm sure the stock one is pretty restricted by now

so if i go catless my car isnt gunna be throwing codes or the check engine light? ill just throw black sut out the back all the time right?

[lostforawhile]

so if i go catless my car isnt gunna be throwing codes or the check engine light? ill just throw black sut out the back all the time right?

you shouldn't be throwing soot out the back at all, cat or no cat, and you won't get a check engine light, these are pre obd1, only obd2 cars have the extra o2 sensor after the cat

[A18A]

your car is worth less without it cause the cat has precious metals inside

[AccordB20A]

Yeah just get a system made without the cat and youll be sweet.

[Hauntd ca3]

if you can get away without it, do so.
2.25 inch is the perfect compromise for piping.
to get rid of the kight if you dump the cat, cut the wire at the cat temp sensor and crimp a ring terminal to the end of the wire and bolt it to earth.
the cat temp sensor is just a bi metallic switch that goes open circuit when its to hot.
putting it to ground make it think its fine all the time

[MessyHonda]

yeah go catless..i have a straight pipe and now the car has more room to breath

[Nafs Asdf]

if you can get away without it, do so.
2.25 inch is the perfect compromise for piping.
to get rid of the kight if you dump the cat, cut the wire at the cat temp sensor and crimp a ring terminal to the end of the wire and bolt it to earth.
the cat temp sensor is just a bi metallic switch that goes open circuit when its to hot.
putting it to ground make it think its fine all the time

Cat temp sensor? I didn't know these cars had that. And assuming kight means light, which light would that be?

[lostforawhile]

if you can get away without it, do so.
2.25 inch is the perfect compromise for piping.
to get rid of the kight if you dump the cat, cut the wire at the cat temp sensor and crimp a ring terminal to the end of the wire and bolt it to earth.
the cat temp sensor is just a bi metallic switch that goes open circuit when its to hot.
putting it to ground make it think its fine all the time

I don't think the USDM cars have the cat over tempreture warning light and sensor

[frantik]

im gunna need a new exhaust nose to tail so i wanted to ask what are the pros and cons of going catless?
and anyother tips i should know?

pros: you're not polluting as much
cons: you don't get as much power

[RAZR]

pros: you're not polluting as much
cons: you don't get as much power

yeah well i just found out that if i remove my cat theres a 2500 fine

[Hauntd ca3]

most cats i've come across have a sensor poking out the side of them
they are there so if the temp gets to high it'll let you know.
as cats get clogged up they get hotter which can end up in the carpets catching fire.
the light on the dash looks like a wee straight through muffler with some wavy lines above it.

[Vanilla Sky]

Just get a high flow cat. They're not very expensive, and won't cost yo more than 1 or 2 HP. If you're really concerned with 1 or 2 HP, then you are probably replacing your air filter every oil change and using $10/qt race oils in your 120 HP motor.

As for exhaust size, go with a 2.25 inch pipe. If you go any more, you're not going to scavenge well, and if you go smaller, you're going to have issues flowing enough in the upper RPMs. I'm assuming you'd rather more top end power at the expense of torque down low.

[AccordB20A]

another way to shut the light on the dash up is to simply unplug the box under the seat

[frantik]

yeah well i just found out that if i remove my cat theres a 2500 fine

that is a definite con :-p

[Vanilla Sky]

It is a federal offense to tamper with emissions control devices. While the law is intended to shut down shops that bypass emissions systems, it can be applied to an individual.

The most I've ever heard come from it is a fix-it ticket.

[Nio]

pros: you're not polluting as much
cons: you don't get as much power

Last I checked having a cat removes pollution not adds to it
and removing it gives HP not takes it away.

I remembering gaining half a second pulling my off my 03. Civic In the 1/4

[frantik]

Last I checked having a cat removes pollution not adds to it
and removing it gives HP not takes it away.

I remembering gaining half a second pulling my off my 03. Civic In the 1/4

yes, i posted the pros and cons of having a cat, not removing it, you're right