Tensions flared during the cooldown lap after Alex Bowman’s win at the Grant Park 165 in Chicago on Sunday evening, with Bubba Wallace knocking Bowman’s car into the wall as he vented some frustration. Bowman had just taken down his window netting and had lifted his helmet visor, wiping sweat from his brow as Wallace slammed the right side of his car. Bowman appeared upset on an in-car camera showing the collision. Bubba Wallace had been spun out by Bowman earlier in the race during Stage 1, something Bowman apologized for after getting out of his car. “I have to apologize again to the 23 guys…