Worth It?
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Registered User
Joined: Aug 2003
Posts: 20
Car Info: 03 WRX
Worth It?
I'm doing a little exhaust research for my 03 WRX.
Can anyone tell me if there is a lot of difference in exhaust noise when eliminating the 3rd cat? Also...Is there a noticeable difference in horsepower (noticable enough that it is worth the $)?
Thanks.
Can anyone tell me if there is a lot of difference in exhaust noise when eliminating the 3rd cat? Also...Is there a noticeable difference in horsepower (noticable enough that it is worth the $)?
Thanks.
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Posts: n/a
dont remove the 3rd cat unless ur racing... just get a 3in high flow and youll be good to go. A cat back exhaust can give you 8-20 hp depending on which one you get. If you get a Turbo Back system get a high flow cat and you will see from 12 -25 hp.
If your gonna take away a Cat take away the Up Pipe cat since its mainly for cold start emmissions.
If your gonna take away a Cat take away the Up Pipe cat since its mainly for cold start emmissions.
Registered User
iTrader: (7)
Joined: Nov 2002
Posts: 820
From: San Jose-near milpitas
Car Info: 03 Wrx black sedan + 2013 BRZ
I'd suggest getting the Borla Hush cat back. So far I've liked it and on the dyno it gve me a 10 HP increase (peak). I posted the results in the WRX EJ20t forum, with pics of the dyno graph. You'll lose some power on the low end, but on the high end you'll get a bigger difference than the stock exhaust. Also the Borla looks just like the stock one, so no cops should bother you, at least that's what I'm hoping for here in California.
Link for the forum:
https://www.i-club.com/forums/showth...threadid=41622
Jason
Link for the forum:
https://www.i-club.com/forums/showth...threadid=41622
Jason
Last edited by Wrxneffect; Dec 17, 2003 at 04:40 PM.
most people run catless, but some will put the heat sheilds back onto the downpipe and midpipes so when cops do check underneath they see something that looks like a cat.
with that said, they will probably just write you up for a modified exhaust and u will need to get it measured at a dB station
i might be wrong tho, someone else verify this
btw i'm from california
with that said, they will probably just write you up for a modified exhaust and u will need to get it measured at a dB station
i might be wrong tho, someone else verify this
btw i'm from california
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iTrader: (7)
Joined: Dec 2002
Posts: 10,029
From: Sacramento CA
Car Info: 02 Impreza WRX sedan
Origami posted by ckey
Thanks. Has anyone tried the Vishnu Stage Sub-Zero, or know anything about?
Thanks. Has anyone tried the Vishnu Stage Sub-Zero, or know anything about?
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