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Exhaust & Fuel Delivery Tips on how to get the most out of your bike

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Old 03-23-2006, 04:46 PM   #1
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Drilling out you catalytic converter...

Of the many folks on this site who have opted for a slip-on exhaust, have any you you drilled out your cat after you removed your stock exhaust and, obviously, before you installed the slip-on? Did you find this to be advantageous or could you even tell b/c you prolly never tried to run it with the cat/slip-on combo before you got your drill on. Discuss...

Sidebar: wasn't it badass when you ran your bike with the stock exhaust removed!? That's right, I used the word badass.
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Old 03-23-2006, 04:57 PM   #2
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I didn't even know our bikes had cats... but now I see they added them in '05. That sucks.
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Old 03-23-2006, 05:47 PM   #3
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no performance gains by gutting the Cat, you only need to do it if you get your bike custom mapped as it stuffs up the air/fuel readings. Have fun
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Old 03-23-2006, 06:24 PM   #4
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Cool. Thanks, Birdy. And thanks to Brent (bent240sx) for selling me his Arata slip-on, which I know will make you proud, Birdman.
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Old 03-23-2006, 06:28 PM   #5
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werd. did you get that thing yet?
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Old 03-23-2006, 06:32 PM   #6
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Came today around 4 pm. Looks great! I'll probably have to wait till tomorrow to put it on.
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Old 03-23-2006, 06:33 PM   #7
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Bikes Have Cats?!??!?!?!
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Old 03-23-2006, 06:40 PM   #8
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and sometimes dogs, mine is more of a dog bike. but yes depending on the year and if it is a 49 state or CA bike.
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Old 03-23-2006, 09:05 PM   #9
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"Arata slip-on, which I know will make you proud, Birdman."

as long as YOU'RE happy mate, that's all that matters.
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Old 03-23-2006, 10:52 PM   #10
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i dont think that the 2003-2004 49 state bike have cats correct me if i am wrong
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Old 03-24-2006, 09:27 AM   #11
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Quote:
Originally Posted by beach_33
i dont think that the 2003-2004 49 state bike have cats correct me if i am wrong
You stand corrected. We actually have TWO seperate CAT's installed after each 2-1 collector pipe. It then goes into another 2-1 collector pipe and then to your mid-pipe. Look under your bike and you'll see the 2 humps in the pipe. One on each side. Good luck drilling those out.
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Old 03-24-2006, 11:01 AM   #12
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Good god your bike will STINK if you cut out the cat. Im not much an enviornmentalist, but I do believe that the gains you get from removing a street cat wont be worth the work or smell you get from cutting out the cats. Other people use the road you know.
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Old 03-24-2006, 11:19 AM   #13
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Not to sound ignorant.. But if you put an aftermarket slipon, aren't you just getting rid of your cats anyway?? What would be the difference BDiddy?
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Old 03-24-2006, 11:29 AM   #14
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Originally Posted by Shade
Not to sound ignorant.. But if you put an aftermarket slipon, aren't you just getting rid of your cats anyway?? What would be the difference BDiddy?
No. The cat is in the mid-pipe not in the tail pipe.
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Old 03-24-2006, 05:11 PM   #15
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"Good god your bike will STINK if you cut out the cat."

What a load of crap. LOL But like I said, there are NO Gains from cutting the Cat out, but it has to be done if you want to have your bike mapped correctly.
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Old 03-24-2006, 06:57 PM   #16
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I didn't touch the cat. Just took the new pipe out for a test ride. Loved it. Although I may puss out and put the heat shield back on for the mide pipe. My leg was getting cooked at stop lights.
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Old 03-24-2006, 08:01 PM   #17
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Quote:
Originally Posted by Birdman
What a load of crap. LOL But like I said, there are NO Gains from cutting the Cat out, but it has to be done if you want to have your bike mapped correctly.
Everytime Ive been behind or driven in a car with no cat, the exhaust smelled terrible. I see no reason that a bike wouldnt be any different.
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Old 03-24-2006, 08:44 PM   #18
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Quote:
Originally Posted by BDiddy
Everytime Ive been behind or driven in a car with no cat, the exhaust smelled terrible. I see no reason that a bike wouldnt be any different.
not being a smart a$$ but how did know they had no cats? not just badly tuned.....
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Old 03-24-2006, 09:06 PM   #19
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i drilled out my cat and it does smell worst.
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Old 03-24-2006, 09:07 PM   #20
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Quote:
Originally Posted by Birdman
no performance gains by gutting the Cat, you only need to do it if you get your bike custom mapped as it stuffs up the air/fuel readings. Have fun
:iamwithst
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Old 03-24-2006, 10:00 PM   #21
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thanks for correcting me NRR thats why i posted i wasnt sure. so you are saying that we have 2 cats on our bikes. and birdman its a must to do this to correctly map the bike
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Old 03-25-2006, 12:26 AM   #22
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I drilled mine out. It does make you smell like exhaust after a short ride. I have a Jardine slip on, and it seemed to get a bit quieter after I drilled the cat, but it may just be in my head.
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Old 03-25-2006, 12:04 PM   #23
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Catalytic converters help to "scrub" our exhaust, they help the environment. However since bikes are a small population I do not think they are as big of a contributer to pollution as cars. I feel cars in ALL states should go through federally funded inspections.

If you get a full system dont you get rid of the cat?
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Old 03-25-2006, 12:35 PM   #24
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yes if you have a full system you do not have cats
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Old 03-25-2006, 06:56 PM   #25
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Yeah but funnily enough, the bikes with full systems don't "smell bad" haha It's the bike running too rich that makes it smell bad not the removal of the Cat. BTW the bike is still rich with the cat, but you don't notice it coz of what the Cat is there for in the first place, and hence why you need to remove it before you map the bike. It gives a false (lean) reading when in fact it isn't lean at all. If you're custom mapping your bike, you have to remve it or bung the headers, engine side of the Cat and take the air/fuel readings from there instead.
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Old 03-26-2006, 06:52 AM   #26
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Hey bird call me obsessive, but when I was tuniing cars back in my day that I wanted to learn to tune, I always had 4 EGT's close enough but not too close to the Head, and I would tune it like that instead of one. It paid off one day cause for some odd reason EGT's shot WAYYYY up in one of my cylinders under 23lbs of boost (eclipse GS).

Do you think tuning a bike that way is a good idea or is just one EGT all you need? Or do you even need a EGT, I liked to use them for when I was messing with timing controls under boost, hell even on na cars. Just asking.
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Old 03-26-2006, 11:54 AM   #27
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I was under the impression those things in the 03-04 headers were resonators.
With the cat being that bulbous lump before the midpipe. Yes I know that's a 2005+ but they're the same lumps and why would they put 3 cats on a bike?
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Old 03-26-2006, 12:09 PM   #28
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Government regulations and concerns for the environment
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Old 03-26-2006, 04:32 PM   #29
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do you really have to get rid of the cats to properly tune a Pwr cmndr? I plan on gettin a two bros slip on and I already have the PCIII and I hope they dont tell me i gotta cut my cats out
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Old 03-26-2006, 05:47 PM   #30
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do you really have to get rid of the cats to properly tune a Pwr cmndr? I plan on gettin a two bros slip on and I already have the PCIII and I hope they dont tell me i gotta cut my cats out
If you're not getting a true A/F ratio then you can't tune the PC correctly. The CAT leans out the exhaust gas so taking a reading after the CAT gives the tuner the impression that the ratio is leaner then it actually is. That's why you need to take the readings before the CAT. The best way is to bung each header pipe to tune each cyclinder. But you can rip out the CAT(s) and tune with just one sensor in the tail pipe.

By the picture above you can see the two lumps in the "Y" collector pipe. Those are the CAT's for the 03-04's. Apparently the 05's have a third CAT up by the mid-pipe. I think the 03-04 CA bikes came with that same configuration as the 05's except they also had an 02 sensor before the CAT. Otherwise the ECU wouldn't be able to get a true reading either.
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