Nothing.
My now has Silvia has 220hp with a three inch cat back exhaust, K&N performance injection kit, bleed valve running at 14psi, blow off valve, front mounted intercooler from a Mitsubishi Galant VR4 and an air oil separator.
The automatic gearbox is killing performance but it will still pull low six second sprints to 100km which is enough to embarass WRX Turbo owners.
Struggles for traction in first with 235 tyres on the rear.
Will it improve the performance by just putting an intercooler on the original 1.8 turbo 122HP?
How many HP/KW/PS will I get from that?
Intercoolers are definitely worthwhile if you drive your car hard and essential if you are planning to raise the boost on your car. Remember, if you're raising the boost substantially, the engine will need a lot more fuel. The two best ways to get around this are one, add an extra injector into the system or two, increase the size of the current ones.
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