I think the results from products like these are so minimal its not worth the money. If possible you should pull the injectors and have someone clean and flow test them. Not only will the ultrasonic bath clean them to like new status, you will have a flow report to ensure all are flowing equally and functioning correctly.
If this is not possible I guess a bottle of this stuff wont help.... just dont expect a miracle!
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com