skippy911 Posted April 20, 2004 Share Posted April 20, 2004 Wondering if anyone has done a Header swap on their IS ? I was thinking of swaping out my stock headers for something a little less restrictive. It looks relatively easy, but are there other mods I'd have to do ? O2 sensor ? I've heard that the power gains are better than a cat-back exhaust. Thanks Skippy... Quote Link to comment Share on other sites More sharing options...
bartkat Posted April 20, 2004 Share Posted April 20, 2004 If you get the Toyomoto header, their O2 sim works. Best bet is to also install the low restriction Y pipe with the header. It's somewhat difficult to remove the stock manifold, but with two people working it's not that bad. Go here and scroll down. http://www.toyomoto.com/is300.htm Quote Link to comment Share on other sites More sharing options...
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