Check out the jap exhausts they stick on 350Zs and try replicate that. We used to get one in at work and it sounded mental
Obviously you'd have to go a different layout to make it fit, but some wacky crossover pipes swapping between mufflers seems to be the go
I think they're to stop reversion back through the MAF sensor, which would otherwise read the same air twice. The later 20Vs don't run a MAF sensor so I dunno what they do in that case, but normally ya rip the airbox off altogether and run open ITBs so it doesn't matter.
That's quite interesting on the tensile strength. In theory you could print cylinder heads, right? How lols would it be to whip up some 4AGE heads for it!