This issue occurs on acceleration , most noticeable when merging onto freeway from on ramp 1/2 throttle , the vehicle starts to accelerate normal then hits around 4200 rpm and the boost gauge goes nuts fluctuating up and down and the vehicle looses power , hesitates , surges ( like a flat spot ) then finally gets a little higher in rpm and it will pick up again through the rest of rpm gauge , most noticeable in lower gears ( mines a 6 speed manual , i have taken the car to dealer on 5/30/18 with 1380 miles on the odometer , huffines subaru denton texas , tony the service manager drove my car and duplicated the complaint , he then proceeded to get another new wrx off the lot similar to mine and again duplicated the complaint ( so this is a known issue ) the dealer claims its just a design in the car , its very unsafe as you think you will get up to speed and then it hesitates which could cause an accident , the dealer did say they would open a case with subaru techline which they did not , so i called subaru customer service and filed a complaint , they call back 2 days later and tell me we spoke to dealer nothing we can do , so i proceeded to do an internet search and found numerous people complaining about the same issue on 17-18 wrx models , i currently have 2006 miles on the car and its still doing this , not sure if its a drive by wire , throttle map issue or a flaw in the factory tuning causing this but it needs to to be addressed and fixed , vehicle gives false sense of security on accelleration .