I have APR coils. I did change the plugs at the same time. I only ever had issues with getting off the throttle in sport mode just as the car shifted and it went into limp mode. Only happened three times. After the plugs and coil change, I felt no difference. The limp mode issue hasn't returned. I'm actually more impressed with putting the car on Liqui Moly. Car is so smooth and the engine is quieter. Even the timing chain rattle is less after sitting.