Simple solution- - - - - -find a set of ram's horn exhaust manifolds and toss those headers as far into the nearest scrap iron heap as you can fling them!

The only time I've ever seen headers outperform ram's horns on the dyno has been at full throttle above 4500 RPM- - - -something you're not likely to see very often.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!