Will the 8.1 marine injectors use the same wiring in a stock 5.3 or do you need new pigtails? I have a similar setup and am looking to get more fuel. If I upgrade the injectors do I have to mess with the tune or will my MAF give it the extra air? Sorry to thread jack!

 

Depending on your year they will plug right in. You won't need new pig tails. But you will have to change the injector data in your tune.