If you didn't want a rumble, I would go with P&L at this very moment. Their header has been shown to destroy the dip. The nameless header might seem amazing but it seems to induce a pretty terrible dip and it's also vaporware.
I got tired of waiting for nameless and went with the JDL UEL. Their craftsmanship is top notch. If you don't like it, I'm sure it'll be a super easy sell on the second hand market. I'll sacrifice a few HP for a much nicer exhaust note.
