so i stuck my head under the STI's butt and cleaned the exhaust piping and cans. the cans are stainless but the piping appears regular steel. used some steel wool and metal polish to clean up the Y section and piping leading up to the axle back where u can sort of see it from behind.
kinda like the thing with the Z where u can see dem rusted exhaust flanges.
i sprayed dat matte black using engine enamel. well, with the fujimura cans no issue.