Originally Posted by 2011 STI SEDAN
So, if I am staying stock other than a K&N drop filter, and an AP from COBB (at a stage one flash) a Pro tune (?) is not needed or required...correct. I just want to protect the investment.
Thanks and sorry for the lack of knowledge here, but trying to learn a bit more every day...
A pro tune (custom tune) is not required, but it can be done at any point. OTS tunes are conservative. With a custom tune you could choose to push the car further if you'd like. If you plan on staying at Stage 1 forever, you might want to consider a pro tune. If you are ever going to upgrade, you could just use the OTS tune until you get all of your upgrades done, and then get a pro tune (to save money on paying a tuner).
Here is an example of how a protune can provide larger gains over an OTS tune. The top line is the OP's Stage 1 18psi tune. The middle line is the COBB OTS Stage 1 tune. Not saying that a custom tune will magically (and safely) gain 20hp and 20ft-lbs of torque (in fact a custom tune may gain you very little), but there is the possibility for better gains with a custom tune. A custom tune could also notice spots in the OTS tune that don't look right (if there are any), and correct those. There really aren't any downside except for cost.