Both in their own case. Both used the one time to sync my carbs when I had my GS and it did make a difference.
$30 shipped
No ones synching their carbs for better performance and accuracy huh?
Can you post the model that you are selling and/or pictures?
(https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-xfa1/t31.0-8/10562646_700569290028370_2821258540560905485_o.jpg)
(https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xfp1/t31.0-8/10535783_700569296695036_8838505953539290578_o.jpg)