Thought I'd let you know what MotorDyne advertised their 5/16" spacer back in '06 when I installed mine. It states 11-13 HP and a deeper engine note which is what I felt. Along with a intake/z-tube and a cat back exhaust the sound is increadable.... 
Gary
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'04 G35C "Twilight Blue" Volk SF Winnings/Michelin PS2/Stillen Sways/SPC Endlinks/Richie Strut Bar/Tein H-Techs/Bilsteins/Nismo Diff Cooler/Stillen CAI+Z-Tube/MD 1/2" Spacer ISO/Polished Plenum+PS Tank/HKS Exhaust/Gordee Grounds/KurumaZ Bumper/Impul Sides/JDM Clears/Tint/CFZ Engine Cover/Red Line
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