[eleven]

It took a while but I think i figured it out. This code works for me (X-Cart 4.0.13)

in include/search.php add this code after
$products[$k]['fulldescr'] = str_replace("\n","
",$products[$k]['fulldescr']);

				#
				# Add Manufacturer information
				#
				if (!empty($active_modules["Manufacturers"])) {
					$idholder = $products[$k]['manufacturerid'];
					$products[$k]['manufacturer'] = func_query_first_cell("SELECT manufacturer FROM $sql_tbl[manufacturers] WHERE manufacturerid = '$idholder'");	
				}

In products_t.tpl:

Manufacturer: {$products[product].manufacturer}