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Old 05-21-2011, 03:33 PM
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Icon6 Flex Pipe

Hey you guys!!

Just bought a 1991 Prelude si SLB (Automatic Sport Shift) yesterday. I paid $700 for it, and it runs quite well with the exception of the exhaust. I was told that I needed a "Flex Pipe" for the exhaust and it costs $700 to repair.

Can someone tell me what this is / does? And does this sound like a resonable price to fix?

I have been trying to locate on Autozone / NAPA / ORiley's etc and don't know if I can find one.

Any help will be greatful. Thanks!!
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Old 05-21-2011, 05:16 PM
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Re: Flex Pipe

flex pipe keeps the stress of the moving exhaust off the non moving engine. its just a spring wrapped in wire mesh at the end of the downpipe. some states dont require a flex pipe to be installed in order to be inspected, but its silly not to use one. 700 bones in very unrealistic. you can get an entire preformance exhaust (header, downpipe, flexpipe, cat, and catback) system for cheaper than that.

if you just need the car on the road, ebay sells alot of header sets that come with your flex pipe.

hope i was usefull for a change
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Old 05-21-2011, 07:44 PM
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Re: Flex Pipe

Thanks for the reply! I was sweating like crazy when I heard that.

You mentioned e-bay: would this be an example for the 2.1L engine? I have called all the autoparts places and they said they could not locate it.
90-91 honda prelude OEM exhaust down flex pipe STOCK | eBay


Based upon your explanation of what the "Flex Pipe" was...I'm wondering if this is causing another issue that I have encountered.

The car actually runs great (minus the horsepower leakage due to the exhaust issues). However, when I come to a complete stop at a stop light, the car shuts off. I have to 1) put the car back into park and 2) Restart the engine. It starts right up, but is very aggrivating. Could the flex pipe issue be causing this? I noticed if I am able to slowly break (or pump the breaks) the car does not do this. The A/C is turned off. The anti-lock light is on.

Thanks for all of your help.

Last edited by JAMWILLA; 05-21-2011 at 07:51 PM.
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Old 05-21-2011, 08:25 PM
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Re: Flex Pipe

Yes, that's what you need if you are keeping your stock exhaust manifold. It should bolt right up. The flex pipe is actually the flexible end of the downpipe (which is what that piece in the auction is called). $60 shipped is very reasonable for that so you better jump on it.
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Old 05-21-2011, 09:18 PM
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Re: Flex Pipe

Thanks...

But I don't know which one to get!! Can the flex pipes be used interchangeably between the 2.0L and 2.1L engines? I have the 2.1L.

The link above says "Fits Si Model"

I see another one (below) on ebay that says "Fits 2.0", but looks like the actual pipe is new:
88 89 90 Honda Prelude Si 2.0L Engine Exhaust Flex Pipe | eBay

Last edited by JAMWILLA; 05-21-2011 at 09:21 PM.
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Old 05-21-2011, 10:23 PM
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Re: Flex Pipe

700 is BS...that shop must be hurting
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Old 05-21-2011, 11:48 PM
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Re: Flex Pipe

First of all, it's actually the downpipe you are buying. The flex pipe is part of the downpipe, and you can't replace just the flex pipe unless you cut it off the downpipe and weld on a new one. Just an fyi.

I'll make it easy for you. You definitely want to buy the first one that you posted up. It is for the b21a1, and has the correct o2 sensor placement, in the downpipe. The other one looks new, but it's for the b20a5 (2.0 L engine), which has two o2 sensors located in the exhaust manifold. If you buy that one you'll have to drill a hole and weld a bung in for the o2 sensor. Besides that, I dont' know if it will even bolt up to your exhaust manifold.
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Old 05-22-2011, 07:59 AM
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Re: Flex Pipe

Thanks, Luzer for breaking it down for me. Just bought the old girl 2 days ago, so I'm sure in time I'll catch up.

Thanks to HondaNeedsBoost & Hojemwod as well!

Last edited by JAMWILLA; 05-22-2011 at 08:01 AM.
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Old 05-23-2011, 10:57 PM
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Re: Flex Pipe

700? That's way too much bro. My flex pipe was gone, so my friend gave me a spare one that he had. It doesnt even have to be the original pipe from your car.Almost any would do. The pipe could be bigger or smaller, its really easy to make them fit. I got it replaced for 60 bucks. They cut it, and welded the flex pipe my friend gave me. It was too short so they just added another tube and welded everything. So if yours is just a DD then you can do what i did.
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Old 05-23-2011, 11:09 PM
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Re: Flex Pipe

Hey, Thanks Sketo....

Sorry for being so slow, but what is "DD"?

And did you have a personal mechanic do this or to a shop?

Thanks again for the help.
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Old 05-23-2011, 11:41 PM
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Re: Flex Pipe

dd is daily driver, or a car you drive every day.

You can have any muffler shop weld in a flex pipe for 50 to 100 bucks. But that ebay downpipe is $60 shipped, and you won't have to mess with locating a flex pipe and having someone weld it up for you.
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Old 05-24-2011, 12:02 AM
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Re: Flex Pipe

What luzer said. Well, I'd do it myself but im not very good at welding yet, and don't have a welding machine. So i went to a friend's shop and they did it for me. Think about what you want to do carefully especially if money is an issue. Good Luck!
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