how much horse do you think my 2002 z28 has .......slp full intake bellow and filter, cat back slp loudmouth 1 res. and a mass air flow resistor( about 20 hp). im trying to get my z to 400 hp, but i have to do it around the warrenty i have!!!!sux ***!!!!
i have all those upgrades, but im thinking im about 360 or so? what do you guys think? what else should i do, i have the money for cat, headers and so on, but what do you guys think?

 

Your at about 320+- rear wheel HP.