Has anybody ever compared a Tri-Y (4:2:1) header to a 4:1 header on a dyno?

My ITC Scirocco came to me with a Tri-Y. If I was building from scratch I'd use a 4:1, but I've never convinced myself that I knew for SURE that it was worth $400 to toss the Tri-Y and buy a 4:1.

Conventional wisdom has always been that the Tri-Y had better mid-range at some expense of top end. Since an IT engine is hardly a high RPM screamer, maybe appropriate? OTOH, the fast guys don't typically run them.

Anybody have a thought?