I have a 1998 honda civic lx. I am looking into a header but cannot find one specific to the lx. Airmass, DC, Chikara, and Greddy all make headers but they are for the ex model. Is there a difference in length or dimension to the ex header. I have seen several people running ex headers on their lx's and want to know if it bolts directly up or if there is some fabrication needed. Thanks!