ok, i am wondering about rally exhausts

[wrxisthebest]

do they just run straight piping till the catalytic converter at the end of the piping at the rear of the car and use the catalytic converter as a muffler/cat??

cause this weekend i think im gunna make a new exhaust and im gunna put the catalytic converter instead of the muffler... please let me know asap if u are for sure...

thanks
ryan~

[me_jimmy]

cat in the back needs high revs to get hot enough to work right.
otherwise yea straight pipe + cat in the back, maybe a resonance can somewhere

[saturn]

... turbo, cat in downpipe, straight pipe to back of car.

roar, pop-pop-pop.

[wrxisthebest]

i dont want to look straight piped tho..

i have it right now with a gutted cat and a muffler, and during a rallyx i get plenty hot enough, actually, i can spit flames, so im pretty sure the cat at the end to the pipe would work...

[82rallyrabbit]

during a rallyx yeah but if this car is your DD you'll want it closer to the exhaust ports to work right all the time. If you don't want it to look straight piped best bet is to put a resonator where your stock muffler went and get a tip if you feel the need.

[saturn]

cat at the end of the pipe wouldn't do anything for emissions, it's nowhere near as hot as it is in the downpipe... it might be quieter, but if that's what you're going for, get a muffler for $50... not a cat for $100-300

also keep in mind, reducing the resistance in the flow will affect how your car runs. you'll probably want to get it tuned for the best results... shooting flames is from running rich.


ALSO: check noise ordinances in your area. you don't want a muffler violation ticket.

[Rally OBXT]

Also, something to keep in mind is that changing ANY sort of cat in a car is a FEDERAL crime. If you get pulled over for any reeason and the cop see's that you have some sort of tweaked exaust and don't have your factory cat's in place, you are ****%D. It's a fine in the thousands if I am not mistaken.

That all being said, I know people who run catless and have mufflers only and they don't get hassled with because the car is not too loud and it looks like a cat back only exhaust.

[saturn]

removing a functioning cat is the "crime" part... but I've never heard of an individual getting in trouble for it. especially if you put high-flow cats back in the exhaust. mostly just muffler shops getting fined for it.

so long as your exhaust isn't loud and you aren't flying through school zones, you should be good.

[Galen]

**cough, cough. Jackson Rally Chime in**

[Rally OBXT]

[quote=saturn;105976]removing a functioning cat is the "crime" part... but I've never heard of an individual getting in trouble for it....[quote]

You don't live in Cali where the cops are crazy about this sort of thing. Just check over on NASIOC and you will see that people HAVE been busted and fined.

Now I am not saying don't do it, just be full aware of what can happen to you if you get caught.

[wrxisthebest]

cat at the end of the pipe wouldn't do anything for emissions, it's nowhere near as hot as it is in the downpipe... it might be quieter, but if that's what you're going for, get a muffler for $50... not a cat for $100-300

also keep in mind, reducing the resistance in the flow will affect how your car runs. you'll probably want to get it tuned for the best results... shooting flames is from running rich.


ALSO: check noise ordinances in your area. you don't want a muffler violation ticket.
obviously everyone is confused lol

i am already running an aftermarket exhaust.. no cats, just an aftermarket muffler with 3" piping...

i am not worried about having to pass smog, dont have to because of where i live in cali, u smog the car when u buy it and thats it.

now on the sound portion. i am not to worried. my exhaust is fairly loud as seen here

http://www.youtube.com/watch?v=kldSeb-8LFs

so sound i am not worried about..

[409industries]

I'm pretty sure i saw a thread about this exact same topic only a couple of weeks ago. It had to do with how a lot of the open class rally guys stick a highflow cat right at the end of their exhaust.

subyspawn's STi exhaust
http://lh3.ggpht.com/subyspawn/SLiMu2DTTyI/AAAAAAAACp8/Fd7HC3047Xg/s800/IMG_1195.JPG

[wrxisthebest]

Aaron, thank you for a solid answer...

[wrxisthebest]

also keep in mind, reducing the resistance in the flow will affect how your car runs. you'll probably want to get it tuned for the best results... shooting flames is from running rich.

um, the flames are from the extremely hot exhaust due to me running more than stock components on the vehicle. i am dyno tuned using cobb software(protuned, not the OTS map) running straight pipe on a turbocharged car is 100% ok on the motor since the turbo provides all the back pressure needed for the motor, past the turbo back pressure is not needed....

[sebhockey]

Also, something to keep in mind is that changing ANY sort of cat in a car is a FEDERAL crime. If you get pulled over for any reeason and the cop see's that you have some sort of tweaked exaust and don't have your factory cat's in place, you are ****%D. It's a fine in the thousands if I am not mistaken.

That all being said, I know people who run catless and have mufflers only and they don't get hassled with because the car is not too loud and it looks like a cat back only exhaust.

[quote=saturn;105976]removing a functioning cat is the "crime" part... but I've never heard of an individual getting in trouble for it....[quote]

You don't live in Cali where the cops are crazy about this sort of thing. Just check over on NASIOC and you will see that people HAVE been busted and fined.

Now I am not saying don't do it, just be full aware of what can happen to you if you get caught.

Actually federal law just states that all the functioning cats in the car from factory must be in there and in working order. It does not state that you can't change them for high flow parts. The other charges are state charges for changing the cats. California just has the most restrictive and most rediculous laws regarding emmissions.

[Galen]

Actually federal law just states that all the functioning cats in the car from factory must be in there and in working order.

wait, do you mean "cats", not "factory cats"... I was not aware that the factory sold high flow cats (correct me if im wrong).. Are they just referring to the number of cats (2) must be in place, regardless of if they are OEM or not?

Either way, Iv never heard of anyone getting busted for a high flow cat... so I wouldnt worry to much if your already running a straight pipe. Take a look at the Jackson STi dyno video in the member journal to get an idea of how loud it will be.

[sebhockey]

wait, do you mean "cats", not "factory cats"... I was not aware that the factory sold high flow cats (correct me if im wrong).. Are they just referring to the number of cats (2) must be in place, regardless of if they are OEM or not?

Either way, Iv never heard of anyone getting busted for a high flow cat... so I wouldnt worry to much if your already running a straight pipe. Take a look at the Jackson STi dyno video in the member journal to get an idea of how loud it will be.

Yes, I mean there must be a cat where the factory installed a cat. No where is the federal emmission laws that I have read states that it must be similar to factory specs. Only state laws get that strict, state laws in hippy states.

[Galen]

ahh, gotcha.

[wrxisthebest]

well im taking my OEM MIDPIPE catalytic converter and placing it in the location of the muffler... we will see how it goes, should be done by saturday

[wrxisthebest]

Yes, I mean there must be a cat where the factory installed a cat. No where is the federal emmission laws that I have read states that it must be similar to factory specs. Only state laws get that strict, state laws in hippy states.
for me, it works tho, i have a gutted midpipe catalytic converter, it looks like i have the oem cat...:headbang:

[82rallyrabbit]

if you don't plan on passing emissions why even put on a cat? Your better off with a glass pack muffler or something like that. I'm just trying to understand the why your determined to put on a cat when you don't have a working one on now.

[Galen]

Going green...








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Naaahhhhh :muhaha:

[RA Limited]

yeah, i don't get why you'd bother with a cat if you don't need one... what is the purpose?

http://http://www.alex-motorsports.co.jp/jp/catalog/ca04/img/007_004.jpg

http://http://www.alex-motorsports.co.jp/jp/catalog/ca04/img/007_005.jpg
i can't view the pictures at work, but they should be Alex Motorsports WRC Style muffler/catbacks. One w/ can is $375, one w/o is $250. JDM YO!

[wrxisthebest]

if you don't plan on passing emissions why even put on a cat? Your better off with a glass pack muffler or something like that. I'm just trying to understand the why your determined to put on a cat when you don't have a working one on now.


might as well set up early for open class :guitarist:

[82rallyrabbit]

are you running a 3.5-4 in exhaust?

[wrxisthebest]

nope.. 3"

[82rallyrabbit]

so you're probably gonna upsize it when you turn it into a stage car anyway

[Galen]

I swear 3" is plenty for a turbo car...

[wrxisthebest]

well not a whole bunch of reason too.. it doesn't help really past 3",

[wrxisthebest]

I swear 3" is plenty for a turbo car...
4" is points less no more power than 3"

[Galen]

thats what i was saying... 4" isnt going to give you anything more than 3"

[82rallyrabbit]

thats what most of the RA cars are running

[wrxisthebest]

where did u see this???

[wrxisthebest]

proof or shens

[82rallyrabbit]

http://lh3.ggpht.com/subyspawn/SLiMu2DTTyI/AAAAAAAACp8/Fd7HC3047Xg/s800/IMG_1195.JPG[/quote]

looks a bit bigger than a 3" pipe i'd say

[82rallyrabbit]

i'm not saying you'd gain any power, but it makes as much sense as putting a catalytic converter on your car thats not gonna do any thing just cause the stage cars do it. You don't seem to want opinions you seem to justification of it. Now i think it'll be sweet, but as for the technical aspect it makes about as much sense as putting on a 4" pipe

[wrxisthebest]

its the fact that i have to have one for open class, might as well get it done

[82rallyrabbit]

ok, all the power to ya

[wrxisthebest]

and it sounds sick!