I also own a prowler, had it since new...

the 3.5 is a nice enough engine, has plenty of power for the weight of the prowler, which is even lighter weight 2,838 lb. than the crossfire.

The stock engine:
* High-output 3.5L V6
* 24-valve SOHC aluminum block
* Sequental multipoint electronic fuel injection
* 60 degree OHC
* 253 horsepower at 6,400 rpms
* 255 pound-feet of torque at 3,950 rpms

Since 'new' I've changed out the muffler to a 'free-flow' prowler-owner-designed one... changed the rear end gears, and did a high-flow K&N air filter install. It moves along nicely, but NOwhere near the SRT6.

JMO.

I know this thread's a bit old... a few months ... but still it's active, so thought I'd throw in my 2c if it helps.