Simplify the following text for a Grade 7 native English-speaking person.
Original: While designed as an F1 engine , the DFV was also used as in endurance racing , although its flat-plane design led to destructive vibrations putting stress on devices surrounding the engine , especially the exhaust system .
Simplified: While designed as an F1 engine , the DFV was also used as in endurance racing . Its design led to vibrations putting stress on devices surrounding the engine .