In yall's opinions does the header really improve the performance? I have a Pro1 header, just curious that's all. Thanks.

 

Yes, they do. I don't know about the pro-1, but I do have dyno charts showing the gains you get from the toyomoto Gen1's.

One day I'll have time to do a writeup on that too

 

Hey Das, that'd be really helpful to see numbers before and after. Pro1 is basically the same design as the Toyomoto I believe, however a sweet looking header is the JIC one, but it's also like 1 G! I believe the header adds a lil more to the peak hp, but in doing this, you lose some low end power. Thanks.