You could nickel and dime 25ish hp with bolt ons. 80MM MAF, power pipe 75 MM TB, Systemax II and long tubes, but that wont feel like nickels and dimes to your pockets. Plus it still will drive like a car with a mismatched converter. Or you could take it to another tuner and magically make a friendly 20 more hp. Some Dynos are stingier than others. Was this on a Mustang Dyno or Dynojet? At the end of the day I'd take a hard shifting fun 320 HP over a wet noodle shifting 350HP. Spend the $$ on the converter then go from there.