Well, IMHO, with regards to Rousch products, most are no better or worse than any of the aftermarket industry...IE...it probably either has a leak in it somewhere or the sensor position has been relocated just enough to cause a CEL and other driveability issues because of poor engineering...……..
If you want it for bling, ok, otherwise the oe unit is a cai and will flow about 10% more cfm than the engine can injest without a supercharger, etc.
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Flatheads ain't so bad!
Certified backyard mechanic I & II