As someone who plays a lot of racing games and didn't get Destiny until right after the Tumbler sparrow was no longer available, I have been wanting after that sparrow more than anything else in the game. And I think I have a good solution for allowing the same perks to be on more Sparrows in the game. The sparrow upgrades the Xur sells every week should have the same perks that the Tumbler has. All of my characters have upgraded Sparrows from Xur and while it's a nice change of pace from the Timebreaker and Graverobber, it doesn't feel all that special especially considering it's by far the most expensive item in his inventory. I'm willing to bet the vast majority of players have never purchased a Sparrow upgrade from Xur, let alone even know what it does. But I think adding such fun special perks would add a lot of variety to the gameplay and revitalize the joy of just going out on patrol. I know I would. And Xur doesn't even need to sell those perks every week, but once in a while would be nice. I hope the devs see this post and let me know if they would consider such an addition. Thanks!