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Rob,
The RX4 is not widely spread and I am sure the dealer will not be able to help.
I need someone that can guide me were to start and which parts to look at.
The RX4 that I owe has the F4R. Is it the same engine as the Clio 172?
In the RX4 the engine has 140 HP and is a bit low on Torque at low revs.
I am thinking how to add more power, please suggest on the best path to choose.