ok so if I go for the Cat, which brand and what size should fit in the jdm header the 2 1/4" or 2 1/2" because they have 2 differents size. and about the Cams, did you think that Toda will be the right choice but what stage?. Also, this guy just coll me because I supost to let him about Cams and he say that he will charge me $1800 for the cams, spring-retainers and also he say that it will be good idea to porter -polish the head (or something like that) for the price, including the labor. what did you think?