Catted or Non-Catted DP???
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This is a discussion on Catted or Non-Catted DP??? within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; I have an 07 wrx and I wanna know if I should go with a catted or a non catted ...

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    Registered User Americanrebel20's Avatar
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    Catted or Non-Catted DP???

    I have an 07 wrx and I wanna know if I should go with a catted or a non catted dp?? I woulda bought a non catted one but I keep reading about people having issues with this, especially on the 2.5 engines. Its just the non catted are so much cheaper..lol Also I would obviously be getting a pro tune with the AP I have but I know that the issues cant be tuned out. Any advice would help, thank u

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    Supporting Member mjboudreaux77's Avatar
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    Quote Originally Posted by Americanrebel20 View Post
    I have an 07 wrx and I wanna know if I should go with a catted or a non catted dp?? I woulda bought a non catted one but I keep reading about people having issues with this, especially on the 2.5 engines. Its just the non catted are so much cheaper..lol Also I would obviously be getting a pro tune with the AP I have but I know that the issues cant be tuned out. Any advice would help, thank u
    I don't know first hand... but I have been reading a lot on this since I want to go stage II when the warranty is up. I believe there is a boost creep issue on the 2.5 WRX engines that can only be handled by back pressure. Some people seem to swear by high-flow cat'd DPs (since they are better for the environment anyway), and others just keep the stock cat-back with a catless DP.
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    Master Baiter EJ257's Avatar
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    Read up on your states emissions standards.

    If your state requires a visual inspection of the cats, then you'll want a catted one (unless you want to swap your stocker in a few days before your inspection for the readiness codes and then swap it back out after your inspection).

    The high-flow cats really don't hinder your performance much.

    A catless car is easy to spot/smell, so it's easy for a cop to give you a "modified exhaust" ticket, or even worse, a citation for removing emissions control devices from a vehicle (big fine).

    Helix offers a catted DP for ~$325.
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    Registered User ElBartoRex's Avatar
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    the boost creep can be taken care of with a simple wastegate port.

    I have run catless for years without issues, never been stopped, and even passed inspection/emissions with the use of the accessport (no visual inspection in PA for OBDII). This was on a 2.0 wrx though.
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    Supporting Member mjboudreaux77's Avatar
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    Quote Originally Posted by idipskoalmint View Post
    Read up on your states emissions standards.

    If your state requires a visual inspection of the cats, then you'll want a catted one (unless you want to swap your stocker in a few days before your inspection for the readiness codes and then swap it back out after your inspection).

    The high-flow cats really don't hinder your performance much.

    A catless car is easy to spot/smell, so it's easy for a cop to give you a "modified exhaust" ticket, or even worse, a citation for removing emissions control devices from a vehicle (big fine).

    Helix offers a catted DP for ~$325.
    The WRX has 2 cats in it though.. The DP cat isn't easily visible. If you go catless on the DP - won't the main cat still function and most likely pass emissions?
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    Registered User RealDealTarheel's Avatar
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    Si, both Cats are in the DP. Removing the factory DP and placing an aftermarket catless DP, well, removes the cats. Catless is the way to go, get rid of those pesky environmental devices.
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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by mjboudreaux77
    The WRX has 2 cats in it though.. The DP cat isn't easily visible. If you go catless on the DP - won't the main cat still function and most likely pass emissions?
    Yes, the OEM DP has two catalytic converters.

    However, state inspection fees are set in stone (the inspection station has no say on how much $$ they get). An inspector will go through the process as quickly as possible, as long as he's crossing all his Ts and dotting his Is. The last thing they want is to lose their inspection license, which is why I find it amusing that people post shops that pass them illegally on a public forum. If he doesn't know to look for two catalytic converters, and he sees one, he will pass you.
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    Registered User Ret030's Avatar
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    I say go catted... especially here in PA... its easier when it comes to inspection time... and the cat doesn't really hinder performance that much...

    oh btw... I have a slightly dented helix catted downpipe... it was on my car when I wrecked it... only minor dents... its $200 firm...
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