Here are a couple
First:
HKS Tuned length extractors 4-2-1, to a APEXi N1 3' from turbo back (twisted turbo too) current setup
AutoX
Second:
HKS Tuned length Extractors 4-2-1, to a XSpower SSautochrome 3" turbo back wit my custom twisted turbo DP
1/4 mile
Drag Compilation
Both similar sound, Apexi is alot lighter, but was VERY impressed with the XSpower system, was suprising well made, and is still going strong on a mates STI.