I live at 6000 feet altitude. If I install an SC, do I need to change pulley to get same horsepower as stock SC at sea level? Any other considerations to worry about when running same hp as sea level? Thanks. Don't want too many

 

You could possibly get away with a smaller pulley without changing anything else, but then that assumes you only ever drive at 6000 feet. I'd say get a smaller pulley and an AEM or E-manage and have it tuned at closer to sea level. Then at 6000 feet it'll feel like a normal SC but lower down it'll be a rocket. And most importantly it'll still be safe.