I picked my car up from a major service at a reputable shop tonight, drove it about 45 miles at freeway speeds ( 75-80 mph, short bursts to 100 when traffic allowed ) and noticed sparks from exhaust area at rear of car when I let off throttle as I slowed for offramp! I stopped at first chance once off highway and couldn't find anythingh amiss.....I'll call the shop first thing but wondered if anyone else has experienced this....