You may have a turbo installed on your Nissan 240SX, if you do it's possible you've looked for other ways to increase the performance of your 240SX.  If you're looking to increase performance an intercooler might be what you want.  Intercooler help increase the performance of your car and even helps protect against heat damage.

Intercoolers cool the intake air to your 240SX engine, which allows more air to enter the cylinders providing a more efficient burn of fuel/air which provides more performance from your engine.  The intercooler will do more then just cool the intake air of your 240SX.  As a turbo spins it generates heat, but the turbo is getting its energy from your exhaust which adds more heat to the turbo.  The intercooler will also cool the exhaust gases from your 240SX before they reach the turbo, helping to keep the turbo and intake air even cooler.  This helps keep your 240SX engine much cooler then it would be without an intercooler, and will help protect against heat damage such as cylinder cracking or detonation.

Another thing you need to know is an intercooler comes in two different ways of cooling.  You can buy either an air-air or air-liquid intercooler.  Other then the fact that each intercooler system has a different cooling, there are other factors you need to know.  With an air-liquid intercooler on your 240SX, it usually weighs more then an air-air but can provide more then just cooling of the intake and exhaust gases.  An air-liquid intercooler generally uses water to help cool the gases and doesn't require as much piping for the gases to move through.  With less distance for the gases to have to go through, this can help lower turbo lag on your 240SX providing a faster response time in your turbo.  Some air-liquid intercoolers can even store ice to allow you to cool the intake and exhaust gases even further, but would require constant replacement.

• Increase performance of your 240SX engine
• Help Protect your 240SX from heat damage (detonation/cylinder head cracking)
• An air-air Intercooler on your 240SX weighs less and provides increase performance
• An air-liquid Intercooler on your 240SX weighs more but can provide extra performance and lower turbo lag