Engine/Power - non turbo (All non turbo Imprezas) Who needs a turbo when you have 2500cc? Cams, intakes, exhausts, etc. The 2.2L and 1.8L Subies are cool too.

lots of poping sound...

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Old 08-20-2004, 11:34 PM
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Red face lots of poping sound...

hey guys

after installing my random tech cats, i've noticed an increase of poping sound coming out of my exhuast. I drive an AT so almost everytime i let go of the gas(after fairly hard drive), I can hear the pop. Is this something I should be worried about?

oh my power mods are

Ganz Intake
Borla Headers
Random Tech Cat
Cobb Catback
Cobb "Street" cams

Last edited by big nasty; 08-20-2004 at 11:37 PM.
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Old 08-21-2004, 12:18 AM
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are there any gaskets that you forgot to install with the cats? forgeting gaskets can lead to cold air entering the exhaust system and causing a "storm" with the hot air...thus the "pop" or backfire.
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Old 08-21-2004, 07:17 PM
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its typical with any kind of real exhaust mods. Subaru's do it naturally from the factory, just the stock piping usually supresses it a little. Adding things like headers, exhaust, high flow cat/track pipe, and especially cams will increase this "popping" sound.
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Old 08-21-2004, 10:07 PM
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I have a small leak between the cat and the mid pipe, since random tech cat pipe didn't come with a donut like the stock one, so the shop put 2 gaskets there. I guess thats why I hear it so much, since it doesn't seem like a big deal I wont worry about it as much.

thanks for all the responses.
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Old 08-22-2004, 08:41 AM
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Mine does it as well but I love it! I don't hear no Civics popping... just their annoying whine. :-D

Subaru for life!
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Old 08-22-2004, 09:15 AM
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I've heard that the pop might mean that your car (mine too) is running too lean. Someone suggested to me that some engine management would not only take away the pop, but add a few hp when it evens out the air/fuel ratio.

Luke
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Old 08-22-2004, 07:30 PM
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Yeah thats why I am waiting patiently for I-Speeds RS reflash
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Old 08-23-2004, 03:04 PM
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would a chip like the Proecm work to correct the problem of running to lean?
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Old 08-25-2004, 06:37 PM
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Originally Posted by Lavery
I've heard that the pop might mean that your car (mine too) is running too lean. Someone suggested to me that some engine management would not only take away the pop, but add a few hp when it evens out the air/fuel ratio.

Luke
it would make more sense if it was running rich since the pop is probably excess gas being burnt up in the exhaust.
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Old 08-26-2004, 06:07 AM
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I believe when we say Rich or Lean, we are talking about the amount of oxygen. Right guys?
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Old 08-26-2004, 06:30 PM
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rich or lean refers to the ammount of gas in the air/fuel mixture
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Old 08-30-2004, 01:49 PM
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Originally Posted by Lavery
I've heard that the pop might mean that your car (mine too) is running too lean. Someone suggested to me that some engine management would not only take away the pop, but add a few hp when it evens out the air/fuel ratio.

Luke
i was told that subarus pop naturally because of the richer AFR that they run from the factory.
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Old 08-30-2004, 07:43 PM
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ya they are tuned rich.
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