Robl45 Posted November 25, 2006 Share Posted November 25, 2006 I know the 400h has good performance but was wondering if there are any performance enhancing parts available for it? Maybe another 30 horsepower or so. Quote Link to comment Share on other sites More sharing options...
RX400h Posted November 26, 2006 Share Posted November 26, 2006 I think it is still a bit new for anything like that. I did notice that there is a cold air path through the front hood, directly at the air filter. That design extracts at least a 5+ HP over a non CAI (Cold Air Intake) design. I like it! Dave Quote Link to comment Share on other sites More sharing options...
NeoN Posted December 18, 2007 Share Posted December 18, 2007 well here is another thing you guys can try... take apart the air filter box, there is a first air filter, which seems to be highly restrictive, and remove the piece, there is a second air filter, which seems to be more than sufficient. I also saw a K&N Replacement air filter for the "second" air filter in our vehicles on ebay, for around $50. I'm going to try driving around without the first stage air filter and see how much louder it makes the rx. I will let everyone know of my findings, as im prepared to order the K&N if its not too noisy. -Brett Quote Link to comment Share on other sites More sharing options...
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