horse power

Hello, new to the forum here Earlier this year i purchased a used 2002 mazda protege es with about 110,000 miles. I havent had any problems with the car until recently the car overheated and got a cel code for misfiring cylender #3, i want to say it was p0303. So first thing i do is replace the...

Thought about buying one of these "super chargers" are these legit or is it another ebay scam? http://www.performancechiptuning.com/Electric+Supercharger+5+PSI+Vortex/10/ check it out let me know thanks.

any one tips on easy horse power gain?

Brand new Mazda 6i Injen CAI (works on all 2.3l engines) <EASY 8 to 10 HP BOOST> Installed (fig 1.) From the Injen website (assembled) Comes with everything you need to install including manual. $185 obo