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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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08-04-2013, 06:00 PM | #1 |
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Gutting out the stock cats
Has anyone gutted out the stock cats?
We used to do this back in the day, and it was always a cheap gain. Admitidly on 10 year old cars with clogged cats. But, would be interested if someone has tried this. Might get 50% of the gains of a $2000 exhaust system for 1 hours work on a hoist. I like the idea of it, from a stealth/sleeper point of view. |
08-04-2013, 06:19 PM | #2 |
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You'll get better gains from larger diameter piping than from just gutting the cats in the stock header/front pipe. I would bet you get less than 1-2hp from gutting the stock cats but without replacing anything else.
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08-04-2013, 06:24 PM | #3 | |
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08-04-2013, 06:45 PM | #4 |
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You will most likely lose or not gain any power. Your better off with a straight through same diameter pipe. The hollow cat will disrupt the exhaust flow and scavaging effect.
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08-04-2013, 07:25 PM | #5 |
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I did this to my front pipe. Louder, and engine seems smoother. Especially at higher rpms
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08-04-2013, 07:58 PM | #6 |
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Punching out the cat and inserting a pipe the same diameter of the main pipe could probably show a small gain.
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08-04-2013, 09:21 PM | #7 |
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Good luck getting a pipe through the cat on either the header or the front pipe, too many bends in there.
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08-04-2013, 09:29 PM | #8 |
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you wont see any gains gains going any bigger then 2.5 if you stay NA.
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08-04-2013, 09:39 PM | #9 |
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Waste of time and ozone, get high flow cat and larger diameter piping.
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08-04-2013, 09:58 PM | #10 |
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Seeing as this will cost nothing, I hardly see how it is a waste of time.
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08-04-2013, 10:02 PM | #11 |
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Understand. But, going for sleeper install. Replacing cat with shiny new decat pipe, is a give away. Gutted out stock cat will still look stock.
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08-04-2013, 10:42 PM | #12 |
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how many cats do our cars have? 1 header, 1 over pipe, and is there one in the downpipe as well? Ugh i miss only having 1-2 cats being only in the downpipe..
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08-04-2013, 11:00 PM | #13 | |
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There are ways & means around this CEL, but there is mixed reviews on the success of these methods. Of cuorse you could get a flash/tune to solve this. The one in the front pipe is not measured in this way, and can be removed without issue. I'm all about keeping my 5 year warranty. Also, we have to get our cars inspected yearly, and they love failing modified cars. |
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08-04-2013, 11:14 PM | #14 | |
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