I have a 89 w250 with a Cummins 12 valve. All I have done is fuel pin, air intake, and straight pipe so far. I have a bad injector to replace so I'm thinking of upgrading them all. Also considering new turbo and 3200 rpm spring. The truck is a daily driver. Not looking to pull or race with it just make it a little more fun to drive. Any advice on what turbo/ injectors to get