New Cat back exhaust, what should I do next?
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This is a discussion on New Cat back exhaust, what should I do next? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; So I got a Cat Back exhaust for my '04 WRX It sounds... Just amazing! I still don't know what ...

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    Registered User MisterNBG's Avatar
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    New Cat back exhaust, what should I do next?

    So I got a Cat Back exhaust for my '04 WRX It sounds... Just amazing! I still don't know what it is about the Boxer engine that can get such a rumble to it.

    Anyways here's the pics

    Before
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    Comparison
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    After
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    Final Product
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    So, what should I add next? I want the Up and Down Pipes of course lol and I really want to Tune this bad boy, Any thoughts?

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    Registered User Terminal Kuz's Avatar
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    is that a catback or axleback? Looks good though
    2005 WRX (Silver) SoCal Subie
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    Registered User wrx650's Avatar
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    Both of those for sure. The up on yours has catalytic convertors that are known to get sucked into the turbo so its probably best to replace that asap (Attn '02-'05 WRX Owners: The Importance of the Uppipe Mod). The downpipe will make it sound really mean and stage 2 will be way faster!
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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by Terminal Kuz View Post
    is that a catback or axleback? Looks good though
    It's a cat back, I only showed the first part of it though lol, you know what I mean

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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by wrx650 View Post
    Both of those for sure. The up on yours has catalytic convertors that are known to get sucked into the turbo so its probably best to replace that asap (Attn '02-'05 WRX Owners: The Importance of the Uppipe Mod). The downpipe will make it sound really mean and stage 2 will be way faster!
    Thanks for the advice

    My main goal is to be able to run this WRX along side STi's (stock of course)

    I saw this magazine where this dudes through a STi turbo and fuel injectors into their '02 Auto WRX lol, thing had 300whp though :?

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    Registered User wrx650's Avatar
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    One of my friends did an sti turbo swap, bigger injectors, and a bigger fuel pump and ran e85 with a pro tune. Not exactly sure what his numbers were, but I'm sure they were pretty decent for the amount of money/work he put into it.
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    Lando Calrissian DemonWRX's Avatar
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    Quote Originally Posted by MisterNBG View Post
    So I got a Cat Back exhaust for my '04 WRX It sounds... Just amazing! I still don't know what it is about the Boxer engine that can get such a rumble to it.
    So, what should I add next? I want the Up and Down Pipes of course lol and I really want to Tune this bad boy, Any thoughts?
    it is the unequal length headers that makes the rumble. Basically the driver's side exhaust beats have a longer way to travel then the passenger's side, creating a 'thump pause thump' pattern
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    I would lose the mud flaps.

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    Lando Calrissian DemonWRX's Avatar
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    I would keep the mud flaps.

    Living in PA there is snow....and that means PennDOT crews throwing lots of salt, cinders, ash, sand, and gravel in the winter....and lots of municipalities up here use the dreaded 'oil and chip' method of resurfacing throughout the summer.
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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by DemonWRX View Post
    I would keep the mud flaps.

    Living in PA there is snow....and that means PennDOT crews throwing lots of salt, cinders, ash, sand, and gravel in the winter....and lots of municipalities up here use the dreaded 'oil and chip' method of resurfacing throughout the summer.
    Yeah we just go like an inch of icy snow and I tested Subaru's name on these back roads at around 4am hahaha So much fun! Turns out the car is capable of more than the 'average' driver is. But I'll get better at it Totally keeping the mudflaps though, it is a rally inspired car after all. It's meant to get dirty once and awhile

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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by Callahan View Post
    I would lose the mud flaps.
    Lol. To each their own I suppose :? I'll stick with the flaps though, although I could use a new pair for the back at least, the right one is crooked (missing bolt) and the other is scraped up. Maybe some Rally Armor mudflaps would look nice

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    Registered User wrx650's Avatar
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    New Cat back exhaust, what should I do next?

    Quote Originally Posted by MisterNBG View Post
    Yeah we just go like an inch of icy snow and I tested Subaru's name on these back roads at around 4am hahaha So much fun! Turns out the car is capable of more than the 'average' driver is. But I'll get better at it Totally keeping the mudflaps though, it is a rally inspired car after all. It's meant to get dirty once and awhile
    What kind of tires do you have right now?


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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by wrx650 View Post
    What kind of tires do you have right now?


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    I have 'used to be' nice street treads. But they're very worn out so they are borderline slicks right now lol

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    Registered User wrx650's Avatar
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    New Cat back exhaust, what should I do next?

    Quote Originally Posted by MisterNBG View Post
    I have 'used to be' nice street treads. But they're very worn out so they are borderline slicks right now lol
    Where do you live? If it snows you probably should get some winter/snow tires. Pretty dangerous and scary without them ha.


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    Registered User MisterNBG's Avatar
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    Quote Originally Posted by wrx650 View Post
    Where do you live? If it snows you probably should get some winter/snow tires. Pretty dangerous and scary without them ha.


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    Northern PA, I am saving for some better treads.

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