Fantastic service. Sent very quickly. For those wondering how it sounds, I installed it on my 1.6 liter Miata, it sounds like a classic tuner sound. Not super annoying like those civilians you hear all the time. Sounds good. Something like 4AG AE86 if you know how that sounds. If you travel like a normal person and switch to 2-3 thousand, you won't even notice that you have it. But once you push the pedal to 4k, you unleash the true power of this thing.