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Do Hollowed-Out Catalysts Make Power? - Fact Or Fiction

Debunking Tuning Myths
By Luke Munnell
Hollowed Out Catalysts Make Power Fact Or Fiction Run1
Run 1: Stock Catalytic Converter... 
   
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Hollowed Out Catalysts Make Power Fact Or Fiction Run1
Run 1: Stock Catalytic Converter
Our first order of business was to fit this universal catalyst to our Project Miata test car, strap it to the rollers of SoCal inline-four guru Mark DiBella's Dynojet dynamometer, and power through three Fourth gear pulls, to establish an average starting baseline.
Hollowed Out Catalysts Make Power Fact Or Fiction Run1
Hollowed Out Catalysts Make Power Fact Or Fiction Run2
Run 2: Gutted Catalytic Converter... 
   
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Hollowed Out Catalysts Make Power Fact Or Fiction Run2
Run 2: Gutted Catalytic Converter
Next up, we hollowed the universal cat out with a floor jack handle (much like we used to back in the day), bolted it back up to the roadster, and established new average power and torque marks.
Hollowed Out Catalysts Make Power Fact Or Fiction Run2
Hollowed Out Catalysts Make Power Fact Or Fiction Run3
Run 3: Testpipe Finally,... 
   
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Hollowed Out Catalysts Make Power Fact Or Fiction Run3
Run 3: Testpipe
Finally, replacing the cat with a properly built, straight-through test pipe of the same diameter piping as the rest of our exhaust, we conducted three more pulls.
Hollowed Out Catalysts Make Power Fact Or Fiction Run3
Hollowed Out Catalysts Make Power Fact Or Fiction Fiction
MD Automotive
714.891.1113

http://www.markdibella.com
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