As andy was saying you only need a regulator if you plan to use stock computer. You will usually see 42-45 psi with the stock regulator. If you want more pressure just add the aeromotive A1000-6 in the return line to go higher. If you plan to drop pressure for some reason then you will have to disadle the stock one on the rail. As a general rule the S5 is too rich to begin with so unless you play with sensor inputs you will not see a gain.
http://www.summitracing.com/search/B.../?autoview=SKU
Steve Eckerich
ITS 18 Speedsource RX7
ITR RX8 (under construction)
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