The following dyno tests were performed on a SuperFlow SF901 engine dyno at the University of Northwestern Ohio.  The power numbers are standard corrected data for 29.92 inches of Hg, 60 degrees F, dry air.  The engine was tested with full accessory drive and exhaust; as in the car, with catalyst, then without the catalyst.  As you can see, the 3" catalyst I am using uses very little power and drops noise levels dramatically.  Here is a short description of the engine I ran that came out of my GTA:

bullet L98 350 cast iron, factory roller block, bored .030 over
bullet Trick Flow Gen 1 Twisted Wedge aluminum heads
bullet GM LT4 HOTCAM, (218/228 duration @.050, .492 lift)
bullet 1.5 ratio roller rocker arms
bullet 11:1 compression
bullet Superram Intake w/ Edelbrock hi-flo base
bullet 52mm throttle body
bullet stock bosch MAF sensor w/o screens
bullet Heddman shorty f-body headers w/ 1.625" primary tubes
bullet Heddman 2.5" mandrel y-pipe for f-body
bullet GM 3" 3-way catalytic converter
bullet for more info click here

 

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