This is all speculation, but Dre's old built DE custom header on his VE gained him, IIRC, 6 whp over the Hotshot Gen 6 headers and I don't remember the wtq. That header did not have a megaphone. I am sure Dre can chime in with more specifics. If i had to take a shot in the dark, I'd say these headers are good for over 10-15 whp over any header available on the market for the VE. Mike K. had some great results also out of custom race headers in his beat up DE.STRATTON said:id be intrested in what gains these headers offer. if they are substantial enough to warrant the price, ill cop one and sock it away in the garage for the future.