this is a cold air intake that i made for a fellow AE86er. it is made of 2.5 inch mandrel bent steel. it has been buffed and clear coated to prevent rust. we went with steel for cost. stainless would have been 3x the price.
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as you may tell by the pics a 2.5 inch hole had to be made beside the radiator for the pipe to fit through. a 90 degree elbow was also used from the intake manifold to the air flow meter to get it in a better location. fairly easy job, looks good too.