i have a 3.4 L v6 with a flowmaster american thunder catback.
approx. how much hp do i have? i know it's nothing exact unless i get it dyno'd, but... i know it's nothing great b/c it's a 6, but i'm just curious

 

about 160, if ur lucky perhaps a little more

 

The 3.4L in the 4th gen fbodies has 160hp stock. Flowmaster is known to give you little if at all gains. I would say around 163-166 hp on the flywheel.... So around 136-140 on the rear wheels

 

cool!

thanks!