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You sould have the new tires mounted FIRST, then have them do the alignment at the same visit.
After
Not necessarily. If the car was in alignment prior to getting the new tires, it will be in alignment after the new tires. It isn't a bad idea to check the alignment periodically and it is probably better to check it more frequently than when you get new tires.
Good idea to do at the same time
No. If there had previously not been any alignment issues, and as long as the new tires are properly balanced, you will not need an alignment.
Yes, alignment can be done either way.
No.
The tires have nothing to do with alignment. The car could be aligned with the scalloped tires. They are scalloped from bad alignment, shocks, struts or damaged to the front end. An alignment in itself may not fix the problem. There may need to be some new parts installed before the alignment. You only need to replace the two scalloped tires. A four wheel alignment can be done with new ones on the front and old ones on the back. Rotating them at some point will not affect the alignment.
new tires does not mean you don't need alignment. it is always a good idea to have the vehicle aligned after new tires are purchased to avoid premature wear, even if the car shows no sign of mis-alignment.
You could, but it would be more accurate with new tires.
I'd at least have it checked, just to be sure everything's fine
they are not always required but if the old tires had an odd wear pattern it would be in your best interest to have an alignment