i mean, really don't bother to weld the exhaust. You are gonna spend more than 60 to weld the hangers, and other 60/hrs for those guys to test fit the exhaust. I can tell you that my friend paid 150 for fixing his exhaust from rattling. That is more than 650 already, but one is actually made for S14.
Buy the rc plane for now, get the exhaust when you decide to get turbo.