[carsebuco]

A few months back I bought a new set of wheels, the old bronze xxr 527's 18x8 +42, and I had them installed by Firestone since I have their lifetime alignment, with new 225/40r-18 Raptor tires.

I did notice, however, that after installing these wheels with the new alignment the car started to understeer a little. It feels very heavy at the end of the turn, and it just doesn't turn as much.

At the time of, the rep who worked with me said he expected to see some 5mm spacers with the wheels and asked if I had them, to which I said no, of course, since my own research brought me to believe I did not need them.

So:
1) Should I have gotten wheel spacers with the new wheels?
2) If not, did they simply not align them correctly?
3) What could be some causes for this effect?
4) Did I dun goofd?

I'll probably end up going back to Firestone to have it re-aligned, but assuming everything was aligned to be squared off and everything else is fine, should I request some custom alignment?

At times like these I hate how helpless I am.

No suspension mods, by the way.