Nope. Everything is perfect (touch wood). I've had mine about 6-7 months, vtec at 5000 is much smoother, car pulls much nicer at 6000 all the way to 7400 now. I haven't done any dyno's on my car but it is definitely a noticeable improvement.

Would be nice to feel the difference with the mild flash and RBC. Would you reccomend it? I was contemplating the mod but wasn't sure if it just wasn't going to be a waste of time and money.