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Old 01-23-2006, 09:20 AM   #1
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Hi-FLow Cat

Does anyone know if the RT Hi-FLow cat is much louder than stock?

I already have a Borla cat-back installed and am debating between:

Race header.
or
Shorty Header + Hi-Flow cat.


Thanks,


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Old 01-23-2006, 09:31 AM   #2
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why spend money on a hi flo when you can smash the stocker out and get no restriction at all?
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Old 01-23-2006, 09:31 AM   #3
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So it will still pass emmisions and I can sell it without having to put the stock parts back on.
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Installed: AEM SRI - FC Shorty - Borla CatBack - 15% tint, VF Mounts, Titanium Lug Nuts
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Old 01-23-2006, 10:45 AM   #4
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Quote:
Originally posted by domesticdisturbance
why spend money on a hi flo when you can smash the stocker out and get no restriction at all?
You don't want to do that. IIRC the cat is not a good extension pipe. I think what it is is the surface inside the cat isn't good from the actual gutting and if the diameter is different it will mess up the flow. It maybe even be the cat diameter is bigger than the rest of the exhaust (maybe bigger than 2.5?) and that will restrict your exhaust.

http://www.focusfanatics.com/forum/showt...ht=gutting+cat
Heres a bunch on the subject.
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