Any here actually installed an aftermarket afe or evo racewerks catted downpipe 200 cell per sq in or 300 cell. Was curious if they still cause check engine light issues,and what actual gain from stock compared to a full catless downpipe. I need it to be street legal /pass inspections.
http://www.evolutionracewerks.com/node/269
http://afepower.com/shop/details_new...0L&&brandID=99