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MY00/2.5RS/Silverthorn
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47 Posts
Discussion Starter #1
Will getting a high flow cat take me out of STS? Thanks for the info.

Brood
 

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254 Posts
Yes, a high-flow cat will make you illegal for STS. STX alows the replacement of the RS and WRX cat(s) with a single high-flow unit.

We have load of info like this on our team web site: www.subrew.com

Chris H.
 

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179 Posts
keep the cat! =)


meow~ keep the enviroment clean hehehe


i blew an o2 sensor without moddin much on the engine....then again it seems to be a common prob...
 

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Premium Member
95 Impreza L AWD
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973 Posts
Hey Peaty, could you tell any difference on the butt-dyno between the high-flow cat compared to the original?
 

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Scoobymods Guy
2010 Legacy 3.6R Limited
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1,157 Posts
First of all it made the whole exhaust sound deeper and louder. It pops a lot more now on decel too. At first I didn't like how much louder it is but now I'm use to it. I have a Stromung though so it wasn't all that quiet to begin with. (I have an AVI sound clip if anyone wants me to e-mail it to them - The one on my image station account isn't working again)

That being said, the butt dyno says the car seems to reach redline quicker and top end is improved. I personally think it's a worth while mod. I've seen info to the effect it adds 14 - 18 BHP but I take things like that w/ a grain of salt.
 
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