Yes they do sell it at walmart now

 

You should try it in your morning coffee, Pete. It'll take care of your exhaust back-pressure problem!

 

the z28 i bought had been sitting in a garage for years, after changing plugs/fluids and other maintenance stuff the first thing i did was seafoam the car through the t/b until the car died(didn't take long), i let it sit for 30min and when i turned it on there was white smoke everywhere, seemed to have worked, def. helped throttle response