If anyone has Kinetix HFC's in their X sedan, can you please comment on how you like them. I have a 10' X sedan with Kinetix HFC's, Megan Racing Y pipe and Topspeed Pro Exhaust. I have no problem with the HFC's except for a weird high pitch rattling/raspy sound at around 3k+ rpm giving it hard throttle. I thought it was a leak somewhere but it doesnt sound like a leak I think. I dont have any rattle or drone at idle but I get this honda civic (no offense) hight pitch rattle sound when I push it hard. I am not sure what it can be but just wondering if anyone else experienced this? Thanks.