Adding a wide header in Agency Pro. http://sridharkatakam.com/add-wide-header-agency-pro/

functions.php

//* Remove the default header
remove_action( 'genesis_header', 'genesis_do_header' );

//* Add custom header
add_action( 'genesis_header', 'sk_do_header' );
function sk_do_header() {

	echo '<div class="my-header-image"><a href="http://genesis.dev/"><img src="http://genesis.dev/wp-content/uploads/2014/01/header.jpg" /></a></div>';

	genesis_markup( array(
		'html5'   => '<aside %s>',
		'xhtml'   => '<div class="widget-area header-widget-area">',
		'context' => 'header-widget-area',
	) );

	do_action( 'genesis_header_right' );
	add_filter( 'wp_nav_menu_args', 'genesis_header_menu_args' );
	add_filter( 'wp_nav_menu', 'genesis_header_menu_wrap' );
	dynamic_sidebar( 'header-right' );
	remove_filter( 'wp_nav_menu_args', 'genesis_header_menu_args' );
	remove_filter( 'wp_nav_menu', 'genesis_header_menu_wrap' );

	genesis_markup( array(
		'html5' => '</aside>',
		'xhtml' => '</div>',
	) );

}

style.css

/* Wide header
--------------------------------- */

.site-container {
	padding-top: 0;
}

.site-header {
	position: static;
	background-color: transparent;
}

.site-header img {
	vertical-align: top;
	margin-bottom: 0;
}

.site-header .wrap {
	position: relative;
	max-width: 1220px;
}

.site-header .widget-area {
	position: absolute;
	right: 10px;
	top: 10px;
	width: auto;
}

.site-inner {
	padding: 3% 0;
}

.genesis-nav-menu a {
	color: #282828;
}