i have a 2011 mazda speed 3 and want to purchase the cs cat back exhuast $749,cs down pipe $299,cs race pipe with cat $349 and the cs short ram intake $254.Now for my question.what do i need so my mazda doesnt blow up and runs at its highest potential.ive heard cd fuel pump aswell as some kind of data log.im 100 % new to tuning so please be honest and frank about my decisions.....and please dont laugh at me lol.thanks
