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X2 Copper only in both of my turbo cars!

Here is a good article on int/exh pressure ratios. Under the sub heading "Turbo cam basics" http://www.hotrod.com/how-to/engine/ctrp-1106-turbo-camshaft-guide/

Ideally, you want less exhaust pressure than intake pressure. A lot of it depends on the turbo manifold design and size of the turbine wheel and housing and exh pipe size exiting the turbo.