Just wondering if this will make a lot more noise? Anyone recently installed one? What about this business about making my car runn too lean? What does that mean?

 

you can hear more air rusing into the intake, but it's not really "loud" per se.

As for running lean, it means that by adding more air into the engine, the air / fuel ratio is effected. More air would be "lean", more fuel would be "rich"

An ECU upgrade from technosquare will allow you to adjust these things and accomodate for the "lean" conditions created by the new plenum.

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And why is running too lean a bad thing?

 

You risk DETONATON......KABLOOEY.
Engine go bye bye.
But i don't think you have to wory with the plenum. :P

 

Actually to a point on a NA car, running "more lean" creates "more hp". Do a search on google for "lean rich stoichiometric" or "air fuel ratio AND stoichiometric AND gasoline" and you will have more info than you ever thought possible...