Spearco and HKS both make an intercooler kit. Both cost around $1100, but can be had for just under $1000. The spearco is generally regarded as the better of the two, but the HKS unit is decently nice as well.

Lots of people like to put an intercooler from a tiny 2 liter 4 banger jap car on their Z. Conquest intercoolers are the most often used. Beware of doing this - these small intercoolers are inadequate for your Z unless it is basically stock. In case you're wondering, intake, exhaust, and a boost controller is basically stock.

The best OE intercooler yet is from a mk4 supra twin turbo. These units will manage well over 400 horsepower, are cheap and readily available, and are very compact.

An intercooler on a basically stock car is usually not worth the effort, time, and money to install it unless you are going to do further modifications.

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