Okie, the new Whipple "valley" kit is the schit! Yes, it is more costly than say a Vortech or Procharger... but well worth the $$$ in my personal opinion.
One really nice thing about the Whipple is packaging. I'm currently running the older "side mount" style Whipple's and it was a tight fit to say the least. While the Whipple obviously consumed quite a bit of extra real estate under the hatch, it was still much less than the Pro Charger. The new Whipple "valley" kits only add 1.5" of forward clearance, and nothing up top (compared to the HP500's). Also, my Whipple kit was pretty bug free from the get go. I had a couple of issues with loose connectors in the wiring harness and the motor initially ran rich at cruising speed. I had Whipple support re flash the ECU with new calibrations and it cured the rich problem. I've heard stories about the Pro Charger support being less than desirable (I read about it on the Internet... therefore it was all true!)
As far as power capability goes, it can be argued over and over which one is better. Honestly, I don't think there is any major differences. All the centrifugal blowers will be making good boost by 4000 RPM. Sure, the Whipple can make boost at 1500 RPM, but when are you honestly going to need boost that low? Every time I "nail" the throttles in my boat, I'm already beyond 4000 RPM before I get a chance to look at the tach's. However, the mid range punch of the Whipple does feel a little stronger than that of a centrifugal type blower. In a single engine, or heavier boat, I would think the difference between the two might be more noticeable.
Which ever you choose, I'm sure you'll be happy with it. You will probably hear a lot of people feed you the typical lines: "You need new head gaskets. You need O-ringed heads. You need blah blah blah..."
I logged about 150 hours on my setup before I smoked a piston... and I'm suspicious that the piston was going out long before I installed the blowers. The good motor still runs strong. These were 454 MAG EFI's that were dyno 'd at an honest to God "real world conditions" 550 hp. If any part is a weak link on these motors, I would have to say it's the pistons / rings. Even then, I wouldn't loose any sleep over it.
Last edited by Bayley; 09-11-2003 at 03:21 PM.