It sounds like you are the one that needs to be a grown up here.
Big deal, let him buy what ever he wants and blow it up. He did it to his last car, he'll do it again.
I mean no hard feelings for what I post on this website. Anything I type/write/post/say on this forum is only that of general debate and discussion. I am not biased toward anyone or anything. I am neutral in everything I do on this website. Only those facts that are presented to me sway my thought process and siding of each discussion topic that I post about.