Hmm.. ok, general consensus is that it may be an FS Werks 4-1 header. Now, my other question is this:
Is there any noticeable performance differences from a 4-1 header, vs a 4-2-1 header? (The only difference I'm aware of is the design - 4 pipes in to 1 vs 4 pipes into 2 into 1)
If it wasn't for law enforcement & physics, I'd be unstoppable.