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The main advantage is it's simply a larger capacity engine, longer stroke on the crank, more space for air to get into the engine basically, the more oxygen you can get in and squeeze out the better :)

The original 5e's had higher compression than the 4e, using domed pistons rather than flat tops like you find in a normal 4e. You need to lower the CR with a turbo and 5e unless you plan on good management and high octane fuel (as in 105RON +, not pump petrol). They also have more aggressive cams (marginally) which you can use in a 4e head.

As an example we use low compression pistons in our 5e with a 1.2mm gasket, this gives a CR of 7.8:1, stock 4eftes are 8:1 so a little lower but good for the boost we run. If we had used flat tops like stock 4efte pistons the CR would have been circa 8.8:1 which is too high for our application, some tuners will do this and use a really thick head gasket to lower it back down again but we think it's best to lower the CR using pistons and chamber area rather than gaskets, gaskets are the weakest part so adding more of the same material isn't always great the best but everyone is different :p

No doubt that will have 4efte pistons to lower the CR down to turbo levels although it's hard to determine the CC drop and CR, if in doubt best bet is to ask although not everyone will know all the specs.

T

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