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Old 08-02-2006, 11:03 AM
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In case anyone is interested, tooling for a mandrel bender STARTS at about 4000.00 for 3" for that type of machine.

The mandrel, clamps, wiper and die are all made to order for each tube size/application. You must have an entire set for each diameter pipe you intend to bend. A change in wall thickness will require a different set also.
They are not typically found used.

I asked a guy I deal with who owns a CNC tube fabrication shop in san jose who has 6 of those machines .

That is why you don't find them in every muffler shop. There is also quite a bit of skill required in using one of those machines. Once the bend is made, I don't think you can put it back in the machine to bend it a "little more" if you did not get it right the first time.
Also ,as they are computer controlled, they don't lend themselves to one off custom work.

A regular tube bender like you find in a muffler shop will allow you to adjust each bend manually if needed..

I usually buy the mandrel bent bends and piece up the exhaust if someone wants it to look "trick".

Personally, other than the looks I can't see any real benefit to mandrel bent systems on a street car.

later, mikey

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  #32 (permalink)  
Old 08-02-2006, 05:46 PM
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It's really not a matter of taking Flowmaster or Magnaflow's word for it, it's pure physics. A smooth pipe with no obstructions offers less resistance to anything flowing through it. Now the question comes down to is your engine producing enough power to take advantage of that less resistance?


WHO'S pushing mandrel bent pipes more then companies who sell them?

It can't be the shop that uses a pipe bender to make an exhaust system.
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