Installing Hiclone just before the inlet manifold will give you between 5-15% increase in power & 10-20% better fuel economy, placing a 2nd just after the inter-cooler will give you up to 50% more than one unit, installing one at the filter end of the induction pipe pre-turbo, will assist the turbo and bring it on up to 600 earlier, this will eases the load on the engine which helps your fuel economy.
Use our fuel consumption calculator
to see what your getting from your fuel, it may surprise you.