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Old 10-09-2004, 11:50 AM   #1
Brandonsask8er
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Flex Pipe

I was just wundering does an after market flex really do anything for noticable power? Why would you spend money on a flex pipe if its going to do exatly what the stock one does. Unless you plan on going with a 2.5 exhaust that would make a difference. I was looking at getting a cat back system. A lot of them arent really cat back they are flex back.


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Old 10-09-2004, 11:57 AM   #2
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if you get the catback the stock flexpipe would be like a kink in a hose. since its smaller in diameter than the catback piping, it just holds up the whole exhaust. when you get a flexpipe, it just clears up the kink, letting the fumes exit more efficiently. They claim to add up to 6HP, but i would ask focaltech, since he has dynoed just about everything for a focus.
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Old 10-09-2004, 12:01 PM   #3
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A flexpipe won't make 6 hp, but it is definately worthwhile.
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Old 10-09-2004, 12:03 PM   #4
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The theory is that better air flow is a must.

By getting a 2.25 or 2.5 cat-back and retaining a 1.75 OEM flex..the air will not flow properly.

Paix...
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Old 10-09-2004, 12:36 PM   #5
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Oh i heard the stock flex had a diameter or 2"
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Old 10-09-2004, 03:27 PM   #6
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nope 1 3/4 inch
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Old 10-09-2004, 04:43 PM   #7
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Stock pipe is like 1 7/8. Flex pipe should be replaced to match the rest of the exhaust. If you get a 2 1/4" cat-back you should get the same size flex.

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Old 10-09-2004, 04:47 PM   #8
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It is well worth it. I could fill a diffrence in mid to higher rpms when i installed my FC flex pipe...
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Old 10-09-2004, 10:16 PM   #9
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Here's the deal with exhaust flow from a fluid mechanics stanpoint. Any constriction/abrupt opening induces turbulence and makes fluid flow less efficient. Theoretically the most efficient exhaust system would start at some defined diameter and progressively open up to some wider diameter at the tip. But there would be no abrupt changes in the header to flex pipe to cat back. By putting a new header and catback on without a new flexpipe you are actually causing two problems - constriction at the inlet to the flex and abrupt opening at the exit. Pay the $150 for the flex. It's way cheaper than the catback or header you will be paying for.
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Old 10-09-2004, 11:28 PM   #10
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Last I checked the flex was $109.

I just checked, it's $109 at www.mcnewsautomotive.com
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