Originally Posted by phunk

That pressure spike is the down side.

You wouldn't need a retune if you fixed it. But you don't need to fix it if it's not causing a problem. It come right back down to spec as soon as you give it some gas. But if it's making you idle rich or giving you startup issues you might want to address it.

Originally Posted by redondoaveb

You've got a twin turbo sound system, I think you met your audio goals.