Good posting. I am in the process of selecting a system.
My research comes down:
1. FABSPEED X pipe with dual resonators for $785 with 15hp and 8 ft/lbs
2.AFE 49-36321 HFC with X pipe dual resonators for $1675 with 19hp and 8 ft/lbs (based on the published dyno test)
In my opinion the list expensive option with reasonable gains comes down to the Fabspeed
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