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Old 09-12-2012, 10:53 PM   #11
st12131
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It sounds way better without the hfc, I've been running a trubendz Magnaflow for almost 2 years now without one

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Old 09-12-2012, 11:03 PM   #12
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It sounds way better without the hfc, I've been running a trubendz Magnaflow for almost 2 years now without one

sent from my Samsung Galaxy SIII using FF Mobile
that's what i figured. would it be best to get another catless downpipe? or cut out my hfc and have a shop weld piping in place?
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Old 09-13-2012, 06:40 AM   #13
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that's what i figured. would it be best to get another catless downpipe? or cut out my hfc and have a shop weld piping in place?
As far as a catless down pipe= the manifold is part of the converter= manicat. Nothing really you can do about that, it hook's up to your flex pipe. If you have a hfc after your flex pipe, you could remove that part & install a piece of pipe in place of your hfc. I don't know a shop that would legallity do that.
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Old 09-13-2012, 08:24 AM   #14
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that's what i figured. would it be best to get another catless downpipe? or cut out my hfc and have a shop weld piping in place?
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Originally Posted by felixthecat View Post
As far as a catless down pipe= the manifold is part of the converter= manicat. Nothing really you can do about that, it hook's up to your flex pipe. If you have a hfc after your flex pipe, you could remove that part & install a piece of pipe in place of your hfc. I don't know a shop that would legallity do that.
I think the OP just keeps calling it a downpipe and thats whats causing confusion. A downpipe is the collector where the four pipes of the header combine into one before the main cat and then flexpipe.

After the flexpipe you have a highflow cat. Removing that hfc with a straight pipe will increase your sound. Like felix said, some shops may not want to remove a cat. Just convince them that the main cat is in the manifold or find a shop that doesnt care.
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Old 09-13-2012, 08:31 AM   #15
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I think the OP just keeps calling it a downpipe and thats whats causing confusion. A downpipe is the collector where the four pipes of the header combine into one before the main cat and then flexpipe.

After the flexpipe you have a highflow cat. Removing that hfc with a straight pipe will increase your sound. Like felix said, some shops may not want to remove a cat. Just convince them that the main cat is in the manifold or find a shop that doesnt care.
Yes. Thanks for clarifying what I mean. I don't see why they wouldn't. They removed the stock one and didn't ask any questions about it when putting on this kit.
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Old 09-14-2012, 09:32 AM   #16
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I'm thinking about a 2.5" HFC for my Focus. It has full 2.5" exhaust (two magnaflows) and OBX header, it's very loud.

Do you think I'll have loss of power if I throw a HFC ? Do you recommend any 2.5" HFC? Magnaflow?
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Old 10-09-2012, 07:24 PM   #17
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A little more back pressure maybe? I have one from magnaflow. Street and OBDII legal according to them.
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Old 08-12-2013, 08:49 PM   #18
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just a little update. buddy works with his dad's engineer/production company and they have a huge shop there. finally got a chance to get down there this weekend. We lifted the car removed the exhaust and cut off that cat behind the flex and welded some pipe in its place. It sounds absolutely perfect now
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