hellow everyone im new to the glanza world I've had a starlet n/a before but a glanza is totally different my manifold are stock nd are leaking im gona replace them nd get a decat aswel my uestion is is it worth getn a decat my mods apexi air filter 5zigen exhaust its runs at 0.6 bar boost but creeps slitly ova ny help will be good thnks