Hi all, After searching the forum fairly extensively, I've noticed: 1) Most airflow topics are on CAIs 2) There is some confused debate about panel filters I appreciate that if one is going to spend over $150-odd on a panel filter that they are better off getting a CAI, BUT what if one does not want to? So, I open this thread to the panel filter debate. First off we have our stock-standard Toyota paper filter. Does the job, over $100 to replace. Secondly we have the TRD filter. Difficult to see when it is dirty, and still appears to be a red-coloured paper filter. Third welcomes the 2252 K+N oil panel filter. According to a doody-jim mechanic at toyota, oil filters are not the greatest as the suction from the engine is capable of sucking some of the oil into the engine. He highly recommended a dry filter. Fourth, which I found on eBay, is the Trust Airinx II filter. Very cheap, but does anyone know what its filtration is like? Fifth... well, you'll have to tell me. I only know about the first four! Six: As some would say - Panel filters are a waster of time. Do everything else, from CAI to porting headers, and talking to mazda boys about dump pipes... :P I await your expertise!