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So you have a downpipe, test pipe, and cat-back exhaust on your EVO and you want more power. If you still have the stock o2 housing, do yourself a favor an upgrade to this high flow invidia unit. The invidia o2 housing flows much better then the stock housing and most aftermarket housings. After installation you will notice a quicker turbo spool and more HP throughout the RPM band.
Fits: Mitsubishi Lancer Evolution 8, 9
Tech Tip: This o2 housing is approx. 2.9″. The other o2 housings such as the megan racing, Authority, and DNP are only approx. 2.3″