Downpipes with/for a catalytic converter
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This is a discussion on Downpipes with/for a catalytic converter within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I want to get the whole Up, Down & Cat Back system for my '04 WRX Problem is, 100% of ...

  1. #1
    Registered User MisterNBG's Avatar
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    Downpipes with/for a catalytic converter

    I want to get the whole Up, Down & Cat Back system for my '04 WRX

    Problem is, 100% of the Downpipes that I've found, eliminate the Catalytic Converter, which would make my car an "off road" car only... illegal, I live in PA and we NEED an annual inspection so I'm not going to risk putting one on anyways.

    So my question is, is there any Down Pipes with Cats? or is that the point of the Down Pipe, to eliminate the Cat? I want the rumble that the boxer engine has muffled by the stock pipes you know?

    BTW love my WRX

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    Master Baiter EJ257's Avatar
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    Downpipes remove/replace the catalytic converters, which means that the vehicle is no longer street legal, since no aftermarket company uses "OE-replacement" level catalysts.

    If you want to keep your car street legal, you're limited to the catback.
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    \_(ツ)_/ Rambo's Avatar
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    Not sure how hard you've been looking, but there are tons of manufacturers out there with catted downpipes for 02-07.

    Invidia, Cobb, Perrin, DaddySCCP, TurboXS, etc all offer catted downpipes. I have a Cobb catted downpipe myself. You can expect to spend a good $200 or so for a catted downpipe vs an otherwise identical catless downpipe.
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    Registered User UEDan's Avatar
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    Re: Downpipes with/for a catalytic converter

    Buy catless downpipe, keep oem downpipe. Switch every year prior to inspection..... damn every year, even as green as CA is, we don't do that.

    Posted from a fone.

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    He simply abides. SD_GR's Avatar
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    I support the use of catalytic converters, for what it's worth. If -- if! -- you can pass with a catted downpipe installed, I'd go for that no question. I'd keep the OEM unit just in case anyway though.
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    Pro Manscaper Mikie13's Avatar
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    Also depends on where you get inspected. Are they big on visual inspections? Believe it or not, a lot of catless exhausts can pass the sniffer test. As long as your ECU monitors are in a "ready" state, you'll pass the OBDII portion.
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    and the Funky Bunch Calvinball's Avatar
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    PA doesn't require a sniffer anyways.
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    Registered User wrx1234's Avatar
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    go to Google type "catted down pipe 2004 wrx"

    also if you have a stock exhaust and add an aftermarket DP you wont improve you sound much... you need to replace the parts after the cat for the rumble.
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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by Rambo View Post


    Not sure how hard you've been looking, but there are tons of manufacturers out there with catted downpipes for 02-07.

    Invidia, Cobb, Perrin, DaddySCCP, TurboXS, etc all offer catted downpipes. I have a Cobb catted downpipe myself. You can expect to spend a good $200 or so for a catted downpipe vs an otherwise identical catless downpipe.
    Do you mind throwing me a link? I can't find one with a cat for that price for the life of me

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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by wrx1234 View Post
    go to Google type "catted down pipe 2004 wrx"

    also if you have a stock exhaust and add an aftermarket DP you wont improve you sound much... you need to replace the parts after the cat for the rumble.
    Ah thanks for the key words, and yeah I knew that, I just wanted the whole sha-bang up,down, cat you know? I didn't want to get all the parts separately.

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    Registered User MisterNBG's Avatar
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    Every search result I find shows nothing but DP's that... wait, here's the quote , "Because this product replaces/removes an OEM emissions control device we must state that this product is for offroad use only."

    Is this just BS the manufacturers slap on the description to cover their own asses? Like when they say, "we highly recommend Professional installation."

    If so then I'm golden right? I can just buy a DP and pass the emission's test for inspection with said DP?

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    OMG WTF MainFrame's Avatar
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    Messing with anything that has to do with factory emissions control is against federal law, whether the aftermarket downpipe has a cat in it or not, unless you're replacing it with an identical OEM downpipe, you're breaking the law.

    It's not really BS, they are obligated to tell you the product is illegal to use on public roads.. but I would venture to say most of us are law breakers here.

  14. #13
    He simply abides. SD_GR's Avatar
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    Downpipes with/for a catalytic converter

    Quote Originally Posted by MisterNBG View Post

    Is this just BS the manufacturers slap on the description to cover their own asses?
    It's a true statement.
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    Pro Manscaper Mikie13's Avatar
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    Quote Originally Posted by MisterNBG View Post
    Every search result I find shows nothing but DP's that... wait, here's the quote , "Because this product replaces/removes an OEM emissions control device we must state that this product is for offroad use only."

    Is this just BS the manufacturers slap on the description to cover their own asses? Like when they say, "we highly recommend Professional installation."

    If so then I'm golden right? I can just buy a DP and pass the emission's test for inspection with said DP?
    That all depends on your state and how lax they are with testing. Perhaps you could get by emissions testing, however it is still technically federally illegal to change anything having to do with emissions on a car. But I am running catless and I know I will probably be able to pass NJ emissions since they don't do visual or sniffer. They just plug into the ECU and as long as that is in a ready state, I'll be good.

    Quote Originally Posted by SD_GR View Post
    It's a true statement.
    Very true. But yes, it also is so they cover their asses.
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    Registered User MisterNBG's Avatar
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    Okay thanks guys I've decided to buy a Down Pipe, screw 'em. Worst comes to worst I'll just swap between the OEM and AM DP before and after the annual inspection, besides, the swap is pretty simple looking, Thanks dudes!

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