Amy
We're running 3.2.1 and have done this too ...
Ryan is correct with the method, just not the code location for 3.2.1. You'll find the code to replace (as in his quote) in func.php which can be found in xcart/include
Just find the following line in the file func.php:
Code:
$product["producttitle"]="$product[product] $product[brand] $product[model] #$product[productid]";
and replace it with the following line:
Code:
$product["producttitle"]="$product[product] #$product[productcode]";
If you then look at the detailed product page, you'll see the product description including the SKU ...
Best of luck
LeeD