ok so i have an ALBA racing pipe, k and n air filter and a modified airbox on my ds and whenever i rev it up and let off the gas it backfires...a few times too. i dont have a jet kit on yet so idk if thats the case. Also along with the backfire come a hugggge powerloss from what it was stock...im not too happy. i was thinking maybe it needs more fuel...actually im hoping thats the case. i was also thinking about how strong the spark is??? maybe i need to get like a rev box...i heard they give u a more powerful spark along with another 1000 rpms... if anyone has any idea about whats goin on plz let me know... i would really appreciate it!!!