The Volvo and Saab Intercoolers are commonly used in Jap cars such as 200SX's as a cheap alternative to a proper Intercooler kit.

They have great surface area, but remember that Volvo's and Saab's run relatively low boost and as such these Intercoolers aren't great for flow.

A Cossie Intercooler would be a better bet IMO and can be bought for peanuts these days.