How much horsepower will i add to my car if i threw a KN Intake and Borola Exhaust System in?
Take a good look at all the engineering that went into that intake system, resonance chambers, air source and routing. Don't throw away a well engineer system for one of those boy racer type intakes! A KN panel will yield enough kick that you can tell the improvement. But on a Dyno it will only be about 3 to 5 horses. You have to be careful on exhaust modifications also. While bigger bore exhausts look great and add horse power it is not across the board. The larger the exhaust pipe the more it helps the top end at the expense of the bottom end. Which means that you would have to be up where many drivers do not want to operate (7 grand RPM or better). In short, a KN panel replacement filter will yield a little. The Borola exhaust will hurt off the line performance, and unless you plan on driving a lot with the engine running in excess of 6,0000 RPM don't bother.
About 2 or 3. Mazda didn't leave much potential to be unlocked in the intake and exhaust, they already are pretty free-flowing.
