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Discussion Starter · #1 ·
Hello I am new to the forum and was wondering if anyone has got rid of thier cat by putting on a up and down pipe to get some more flow in the exhaust? Also whould i have to do anything else to the car like O2 sensors or anything?
 

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Re: Down and Up pipes (Diesel4mee)

It is illegal to remove the CAT period, it is illegal to ask about removing the CAT period. <p>The minimal power gain is no where near worth the destruction to the environment, meaning a car with no CAT probably puts out more toxins then an entire fleet of cars with CAT for maybe 3 HP on the top end. Plus the CAT does a pretty good job as a muffler.<p>Once again get out of the so 70’s mentality that you gotta ax the CAT for performance. Its high school kids crazy talk. <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0">
 

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Discussion Starter · #3 ·
What about track use. Im pretty sure no one runs cats on race or track cars because of the power gain u get by running no cats compared to running even a racing cat.
 

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Re: (Diesel4mee)

Your car will latch up a check engine condition within minutes of running without a cat. The engine control will go open-loop, or maybe even limp-home mode. It will run like [email protected] and you'll wonder why you bothered.<p>Tom.
 

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Re: (Diesel4mee)

like Tom said <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <BR><BR>
<i>Modified by Oldman at 8:26 PM 3-29-2006</i>
 

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Re: Down and Up pipes (Diesel4mee)

I haven't done anything with bypassing the cat nor do I plan to. It's illegal for street use and from what I hear your gain in power is minimal and you could see a loss of low end torque.<p>As far as the check engine light and the oxygen sensors, on Mustangs they use what is called MIL Eliminators to prevent the oxygen sensors from tripping the "check engine light". They plug inline with the sensors that are "behind" the cats. <p><A HREF="http://www.mustangtuning.com/stmilel.html" TARGET="_blank">http://www.mustangtuning.com/stmilel.html</A><p>
 

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Re: Down and Up pipes (v50t5black)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>v50t5black</b> »</i></TD></TR><TR><TD CLASS="quote">As far as the check engine light and the oxygen sensors, on Mustangs they use what is called MIL Eliminators to prevent the oxygen sensors from tripping the "check engine light".</TD></TR></TABLE><p>Just try that with the Bosch ME9 engine control in our car. Even if it worked, the best you can hope for is no loss. So...<p>Tom.
 

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Re: Down and Up pipes (Oldman)

plus it's bad for the environment !!! so the ethical choice here would be not to remove the cat. perhaps try to find performance other ways, but imagine you drove over a large speed bump or other road bump and your cat gets damaged. what to do? you can Legally replace it with a high flowing one, and if it only fits a larger dp to match a larger exhaust then you can legally do all this as well. just don't leave out the cat.
 

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Re: Down and Up pipes (Volvo_girl)

Racing Cars use CATS, at least in Europe in the GT series, they do. You can get the european Kemira racing cat from IPD, or some other High Flow Performance Cat from Magnaflow, much cheaper and quite good for a modded street car. Do not even turn on the engine without a cat, you'll get in a lot of trouble with the ECU.<p>Consider your car's exhaust manifold before upgrading the down pipe. In the new S40 and V40, that could the most restrictive point, then the downpipe and cat.<br>
 

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Re: Down and Up pipes (Oldman)

Not sure where you got that $20,000 fine. The law states that individuals may be fined up to $2,500 per vehicle tampered with. <p>Still, I agree that's expensive!
 

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Re: Down and Up pipes (Jayam)

<I>Consider your car's exhaust manifold before upgrading the down pipe. In the new S40 and V40, that could the most restrictive point, then the downpipe and cat.</I><p>In the "new S40 and V40" or did you mean "new S40 and <B> V50</B>"??? I didn't think an exhaust manifold was a realistic option (yet, if ever) for our cars. That because of the turbo being incorporated into the exhaust manifold. Is there a company out there offering a performance exhaust manifold for this gen S40/V50?
 

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Man, down here in miami more than half the rice population have removed their cats, including several WRX friends that I have...we dont have inspections anymore because a lot of money was being stolen.
 

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Re: (cicatrizdare)

Just because "half the rice population" does something does that make it smart or right? I'd like to think Volvo owners are a little smarter. Like I said 70's high school thinking.<p>Fines from the Feds can be even heavier:<p>"A manufacturer or dealer who removes or renders inoperative any<br>emission control device or element of design installed on or in a<br>motor vehicle or motor vehicle engine is subject to a civil penalty of<br>up to $25,000. Others can be fined up to $2, 500. Anyone<br>manufacturing, selling or installation of any part or component that<br>serves to bypass, defeat or render inoperative any emission control<br>device or element of design is subject to a civil penalty of up<br>$2,500."<br><A HREF="http://www.state.me.us/dep/pubs/is-tamp.htm" TARGET="_blank">http://www.state.me.us/dep/pubs/is-tamp.htm</A><p><BR><BR>
<i>Modified by Oldman at 2:51 PM 3-30-2006</i>
 

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Re: (Oldman)

I also agree removing the cat is not a good idea. <IMG NAME="icon" SRC="http://********************/smile/emthdown.gif" BORDER="0"> <p>I wonder how many, if any, fines have been handed out over the past several years for removing/tampering with a cat.<p>Being a devils advocate, speeding is also against the law and it is probably a lot more dangerous for you, the driver, and others on the road then tampering with the cat.<p>
 

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Re: Down and Up pipes (v50t5black)

Yes, I meant the new S40 and V50.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>v50t5black</b> »</i></TD></TR><TR><TD CLASS="quote"> <I> Is there a company out there offering a performance exhaust manifold for this gen S40/V50? </TD></TR></TABLE><p>According to TME in sweeden the manifold is a high restriction point for the T5 or 2.5T S60's, when upgranding these they change the manifolds for the Volvo "R" cars manifold, it has much better flow. The S40-V50 turbo engines use the same block as the S60's engines, that is why I recommend to verify this before changing a DownPipe and getting not much improovement.
 

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Re: Down and Up pipes (Jayam)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Jayam</b> »</i></TD></TR><TR><TD CLASS="quote">Yes, I meant the new S40 and V50.<p>According to TME in sweeden the manifold is a high restriction point for the T5 or 2.5T S60's, when upgranding these they change the manifolds for the Volvo "R" cars manifold, it has much better flow. The S40-V50 turbo engines use the same block as the S60's engines, that is why I recommend to verify this before changing a DownPipe and getting not much improovement.</TD></TR></TABLE><p>You can't do a drop in replacement of the R manifold on this engine - the turbo is integrated so you'd need to figure out how to handle all of that as well.<p>UKMatt
 

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Ran my Nissan with full 80mm all the way back, no CEL (OBDII) for 4 years in souther california. yes im a sinner, but the t28 responded well to the piping<p><br>I wouldnt do it on the Volvo though, that was my weekend track car, on the outside it looked completely stock
 

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Re: (gdogg16)

..to Volvos? I thought it was in Volvos... damn, I hate not using my car to it's fullest.
 
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