Quote Originally Posted by AnthonyF
An unmolested Si typically will stay at 9k-10k Once you boost it, no matter how much money you spend, it'll only be worth 7-8k.

-Ant.
if he just bolts the kit on, and gets a mild tune. it could easily be reverted back to stock, as long as he keeps the stock parts. but it seems like he might not be getting rid of the car anytime soon.