I went for AEM, should arrive this week. I had Gruppe, felt the gains, and it looks awesome, but I hated the noise.
when i bought my civic from bexleyheath honda gargage, a baddddd garage btw.
it had an k&n induction kit on it and half of the filter was covered when the bonnet was shut. but it did sound alrightish
but now ive got my gruppe coming with a spoon n1 exhaust im sure the sound will sound chrisp