Welcome in @MONKEY , it's good to see another guy from Oregon, I'm on the border of Oregon and Idaho.
I would do a little bit of researched and out what the manufacturer recommends.
A tuned pipe is just that, it's tuned to a particular engine. Some may weaken the performance of your engine.
Whatever pipe fits the particular chassis that it’s going into. It’s literally a “factory replacement” engine for RTR grade vehicles. These pipes are typically (but not always) designed AROUND the chassis layout (Revo, TMAXX, Savage, etc), so if it’s the factory pipe, run it. If it’s an aftermarket that’s designed to fit that chassis specifically-run it. It’ll do just fine-as that’s a “one size fits all” factory replacement style RTR grade engine.