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Old 10-31-2013, 11:11 AM   #1
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Backfire sound from underneath

So my car works fine. But when I downshifting, even I didn't drive it hard, there are some backfire shot gun cracking sound coming from underneath my car. I do not know what happened and it's very loud. But sometimes it doesn't have any sound. What should I do?

exhaust mod: BBK off road x pipe, borla atak catback and a Airaid intake, 93 steeda race tune.
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Old 10-31-2013, 11:18 AM   #2
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Originally Posted by Rileychan01 View Post
So my car works fine. But when I downshifting, even I didn't drive it hard, there are some backfire shot gun cracking sound coming from underneath my car. I do not know what happened and it's very loud. But sometimes it doesn't have any sound. What should I do? exhaust mod: BBK off road x pipe, borla atak catback and a Airaid intake, 93 steeda race tune.
That's what happens when you have no cats. I like it when mine backfires, nothing's wrong with your car it's normal, your setup is basically straight piped because the attack is a resonator style exhaust
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Old 10-31-2013, 11:28 AM   #3
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Quote:
Originally Posted by Rileychan01 View Post
So my car works fine. But when I downshifting, even I didn't drive it hard, there are some backfire shot gun cracking sound coming from underneath my car. I do not know what happened and it's very loud. But sometimes it doesn't have any sound. What should I do?

exhaust mod: BBK off road x pipe, borla atak catback and a Airaid intake, 93 steeda race tune.
Lol, it means its running great!
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Old 10-31-2013, 11:53 AM   #4
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Hot exhaust gases hitting cool air in the pipes, giving you the backfire in the exhaust.
With your setup, it will be common. Add some backpressure, it goes away. But so will your exhaust note. Can't have it all.
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Old 10-31-2013, 01:31 PM   #5
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Lol, it means its running great!
The noise is scary and annoying
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Old 10-31-2013, 01:45 PM   #6
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Hot exhaust gases hitting cool air in the pipes, giving you the backfire in the exhaust.
With your setup, it will be common. Add some backpressure, it goes away. But so will your exhaust note. Can't have it all.
Thanks for the advice!
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Old 10-31-2013, 10:10 PM   #7
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Put in some resonators and it will go away mostly
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