I have a 2013 Mazda5 Sport 2.5L with a shiftable automatic trans, and I was wondering if there was a way I could make more power out of the roughly 150 HP I get, various forums are very vague in regards to being able to tune or swap anything in this vehicle. I know I could just get a Mazdaspeed 3 for a fast car, but I want to make a sleeper out of my minivan. Give any suggestions you have, I'm running bone stock internals aside from an aftermarket engine air filter from K&N (much rather just use a cleaning solution than keep dumping 20-something bucks every couple months on air filters) anything to fortify or enhance this car will help, thanks! (Also don't worry about entertainment or audio, I'm building on those in the future. Stock stereo and speakers sound just fine)