exhaust

[1bad2.3]

if i put an aftermarket header-back exhaust on a u.l.e.v. honda, will that affect the way the motor runs?

[Jarflow]

should
make it run a little better

[1bad2.3]

do you know if it will affect the emissions for the worse or should i just run a factory or oem catalytic converter?

[Jarflow]

i dont know anything about emissions. are laws that strict in your area?
cause i would just run it straight back then you dont get as much as the raspy bumble bee sound

[Someguy]

From experience I've found that every after market cat I've used has not worked as well as stock. Probably because one of the goals of the after market unit is increased flow.

Are you trying to pass an emissions test, looking out for Mom or both?

[b16b bomber]

in a ulev honda headers and cat-back will not affect it at all to past the emissions

[jimmyfunk]

ULEV stands for Ultra Low Emissions Vehicle.....these are basically code words for Ultra Slow Emissions Vehicle. All of the laws and regulations in the United States that bring forth these standards are basically made to save the environment at the expense of......POWER! So if you're question is.....Will this modification kill little turtles in the local pond by my house?...NO, it won't. Obviousely it isn't going to be great for the environment, but it won't affect the emissions of your vehicle to the point where the modification will prevent you from passing an emissions test. Whether anybody wants to admit it or not, our cars are engineered as grocery carrying economy cars...not with the street racer in mind. To make these cars worth driving, things like emissions have to take a back seat in the big picture. So just slap that exhaust on and then atleast our trip to the grocery store is a little bit faster.
(Funny thing....as i was typing this....a Honda emissions commercial just came up on the TV) :hehehe:

[jimmyfunk]

check this out if anyone is interested in learning a little bit about emissions.....it's kinda neat i guess, kinda gives you an idea what they're trying to do with our cars.

http://energy.fullerton.edu/amerisurfers-case3.html

[1bad2.3]

ok thats good now that i know i wont fail emissions, even tho when they do inspections here 90% of the time they dont even check them. but with all that aside, it wont hurt the way it runs as long as i keep the cat on the exhaust or can i change the cat? the only reason i ask is that i dont want to screw up the way the motor runs for the worse by screwing with the cat or anything. thanx alot.

[jimmyfunk]

Removing the catalytic converter will not adversely affect the way your engine runs... the cat's job is to remove toxic matter from the exhaust streams preventing them from entering the outside air...that is it. Removing it will stop this process, but will also affect the sound of your exhaust. You can either remove the cat, or get a "free-flowing" performance cat. Keeping the cat installed will cause some air restriction, preventing your exhaust from reaching its full potential. I'm not a big fan of performace cats becuz in my opinion, if you're really that concerned with power, just take the damn thing off. But like I said.....just my opinion.

[jimmyfunk]

HOWEVER, if you're concerned about emissions tests...which you obviousely are....you probably will want to leave the cat on or get a performance one. My opinion is a little different becuz i don't have to deal with emissions testing and BS like that where I live....so keep in mind that our situations are a little bit different.

[PFCfutrell]

I've heard of aftermarket high-flow cats increasing power more than running a straight-pipe. Even if you ran straight-pipes all the way you'd still be polluting less than the average SUV.

[texan]

Originally posted by jimmyfunk
Removing the catalytic converter will not adversely affect the way your engine runs... the cat's job is to remove toxic matter from the exhaust streams preventing them from entering the outside air...that is it.

WHAT? DO you know a damned thing about OBD2 engine managment? The dual 02 sensors keep an eye on catalytic efficiency, if you remove it the ECU will instantly throw a code. That damn sure afects the way the engine runs, the ECU will trip to fault mode.

[texan]

Originally posted by PFCfutrell
I've heard of aftermarket high-flow cats increasing power more than running a straight-pipe. Even if you ran straight-pipes all the way you'd still be polluting less than the average SUV.

WRONG. An engine's displacement has little to do with it's emmisions output. If that were not true a 2002 Corvette with the 5.7L V8 would never be able to qualify as an LEV car alongside the 2.0L S2000.

[PFCfutrell]

Hmmm... how about because the standards are different for SUV's than for compact cars? When I had my emissions tested with my old car ('91 Prelude SI) I failed in one of the three catagories. When I looked at the emissions sheet for my dads van I noticed that the max on his sheet was higher than what I produced i.e. higher than the max for my car. So if the emissions for my 'lude had been held to the standards of my dads four-cylinder minivan I would have passed, since i was held to my cars standard I failed. A truck qualifying as LEV could pollute more than a non-LEV car just because the max's are higher for what it can pollute. So I am not wrong BIATCH!!!