Regarding pipe sizes and welding a cherry bomb?

Forgive me if I seem idiotic in the field of automobiles/cars/etc, as I will admit I know close to nothing about cars. I'm having a mechanic weld a cherry bomb to my 2002 Honda Civic LX, which has an exhaust pipe size of 1.75". Before I have him weld something too large or too small, I want to do some research so I don't screw things up. I understand that I need an adapter to go onto the exhaust, and one to go on the cherry bomb. Unfortunately, the smallest cherry bomb I could find had an inlet of 1.875". If I were to get an 2" adapter, have the mechanic weld it onto the exhaust, would it be too big? After that, would I be able to have the 1.875" cherry bomb inlet welded inside the 2" adapter, and would it fit fairly snug? I'm sure I'm not making much sense, and if I need to explain don't hesitate to tell me, but I'd really like to know if I'd be able to install this cherry bomb.

I'd forget about an adapter and rent a muffler pipe expander tool from my local auto parts store. O'Reilly's and Advance Auto parts have rental programs in my area.

You only need to expand the existing pipe about an eight of an inch to get a good fit between your existing pipe and your cherry bomb. Then a weld is an easy proposition to seal it up and deter theft.

Rental is usually free, although a substantial deposit is often required.

If your mechanic is in the habit of welding exhaust systems, he may already have the expander tool and will have no problem dealing with your add on.

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