What is the performance gain on these compared to the FI HFC/Test Pipes? Trying to decide if it's worth all the money and trouble of finding an installer for the LTH.
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Current Ride: 2012 Nissan 370Z NISMO #0389
Mods: Fast Intentions Resonated Test Pipes and TDX Exhaust with 18" Resonators (#1054), K&N Drop-Ins, GTR Start Button
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