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Fiesta-Si.com • View topic - Blowy through the backbox after de-cat
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PostPosted: Sun Sep 11, 2011 9:03 pm 
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As you may know I fitted a de-cat, all is well apart from it sounds blowy through the backbox if you know what I mean? Is this normal? I'll post a video tomorrow so you can hear what I mean. But it just sounds a bit rubbish :( all the joints are sealed up and not blowing so I know it's not that

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PostPosted: Sun Sep 11, 2011 9:16 pm 
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Probably normal, it's all straight-through now so maybe it's come down to the fact that the exhaust bore size isn't right for your application? How does it sound driving along with a heavier foot? Most general N/A applications with 4 cylinders shouldn't need more than a 2.25" bore size - What exhaust system do you have?

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PostPosted: Sun Sep 11, 2011 9:18 pm 
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Decats sounds shite on a zetec lol

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PostPosted: Sun Sep 11, 2011 10:13 pm 
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my decat has a silencer instead of the cat and sounds the biz

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PostPosted: Sun Sep 11, 2011 10:22 pm 
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It sounds more raspy now, before it was quite a nice deep noise.

Not sure what size the exhaust is but i use 2 1/8th inch clamps lol

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PostPosted: Mon Sep 12, 2011 10:28 pm 
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raspy is the way!!

when a car is de-catted it does make a funny sort of blowy noise.

i just de-catted the ignis, the exhaust isnt blowing but you an hear the air passing through the exhaust sort of noise if you get me.

fiesta and arosa were both the same...

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PostPosted: Tue Sep 13, 2011 12:10 am 
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Yeah I have had a few people tell me its normal lol. All is good :)

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PostPosted: Tue Sep 13, 2011 8:51 am 
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Mine doesn't sound blowy :P

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PostPosted: Tue Sep 13, 2011 9:08 am 
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but you have the added extra of boost :)

its only blowy when you blip the throttle when you are at stand still, apart from that it seems ok tbh

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PostPosted: Tue Sep 13, 2011 1:07 pm 
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Yeah, it'll just be the reduction in back pressure now I imagine, so when you do put some gasses through it, it just sounds a bit piddly to start with :)

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PostPosted: Tue Sep 13, 2011 10:24 pm 
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