some of the worlds free'est flowing factory cats on the hemis ????
its under the hood..
I'd be unstoppable if it wasnt for Physics & Law enforcement
wow no one knows this one?
dual spark plugs.
chrysler spent alot of time with the design of the firing of the plugs for close to complete burn to lower emissions and were able to free up the cats for flow.
one plug fires just as the piston gets to TDC and the second plug fires on the down stroke