ok sorry been loads of questions regarding this but im after 1 very soon . ive had pipercross etc & k/n kits on other cars and they have been spot on. but now time has come to get 1 on the 172 cup first mod lol . i do no this isnt going to increase any bhp but i do love the sound of them so wots it going to be then please . as there are so many diff one`s for a 172 dont say viper as they just dont do it for me im after sound wise