Modifying Search Templates

Hi,
Just wanting to add a SKU field to the autocomplete suggestion display area (class=”autocomplete-suggestion”). Where is the code/template/filter to override the display or update?
And
Then also updating the actual seach results page (once clicking on the search submit button) template/display
Is there somewhere this can be edited/updated as well
(Looking to update the title – it seems to be a shorter version that is showing)
Thank you for any information you can provide.