cayman 2.0 without a turbo?

saw a totalled 718 yesterday on the highway while i was driving back to my hometown, hard to tell what trim it was as i only managed a glimpse at it but it seemed to be mostly front end collision but it got me thinking. how badly would the inline flat 4 be without the turbo? 2.0 or 2.5 if it makes a difference. compared to the flat six from either 987 or 981 that didn't come turbocharged. i don't know much about turbos but it would seem that if an engine was designed with a turbocharger setup in mind then it would mean that it wouldn't be able to run well without one or the performance would be severely hampered.

EDIT: flat 4 not inline.