Hello everyone, I recently purchased a 2015 STI Limited with 49,000 miles. I knew going into it some modifications had been done but not sure exactly what. Went to Subaru had a health check up done and to make sure it was running a tune and not running a base stock and whether or not I should...

I recently put on a Invidia catless DP, borla hush exhaust, HOA 3 port boost solenoid, and has an SPT intake. I went and got it tuned at a local tuner. He said tune is done but my plugs were bad and car has a slight misfire at higher rpms due to this. I asked if everything would be fine with...