So the main difference is that tubing is mandrel bent and piping is bent with a hydraulic pipe bender? Not to mention "piping" is used for pretty much every other application that would not be exhaust. So the misconception is "exhaust pipes" are underneath a vehicle.

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'73 Scamp (the girlfriend): 225ci super/6 2BBL conversion (Almost done!)
'90 Subaru, wagon (the wife): H4-cyl 2.2L

1977 Mercedes-Benz 300D, 5cyl diesel(For sale!)

Mandrel-bent tubing means that the bending machine has a part that fits & supports the inside of the tubing. The bends are smooth & the are same diameter as the straight sections.

Generic benders just "mash" the tubing into shape from the outside- the bends are wrinkled & crushed down to a smaller diameter. A 2.5" tube might end up 2.25" or (much) less.

I've used flux-core wire feed welders & can't reccomend them. They work,but gnerate LOTS of sparks, spatter, & slag. The extra $250 I spent on a gas MIG conversion kit & a small welding gas tank (C25) was the best money I ever spent.

Yep, exhaust "pipes" is just slang.

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63 Valiant Wagon
225 - 4 bbl

No, the difference is in the sizing, for instance, 1-1/2" pipe and 1-1/2" tubing are not the same sizes. If you order 1-1/2" pipe, it will be 1-1/2" on the ID( inside). If you order 1-1/2" tubing, it will be 1-1/2" on the OD(outside diameter). So you need to have the correct mandrel for either pipe or tubing. Using a 1-1/2" pipe mandrel for 1-1/2" tubing will ruin the tubing because the radius of the pipe mandrel doesn't fit the tubing correctly to support it as you make the bend. Pipe and tubing are two completely different things, so make sure you make that distinction when you talk about it to anyone in the industry or you will get the wrong product.

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There's no such thing as too much cam....only not enough engine!