Wouldn't the PCM reprogram void your warranty if discovered?

CumberlandHeat, do some research! I paid $4,600 for CMI Sporttube headers for my HO and saw ZERO increase in performance. The same has happened to others. Just a heads up. Save your money for something that will buy you real HP. JMO (btw my hull is very responsive to power ups)

keep us posted on the results, and how the install was, i'm considering the dana's for my rage with the HO, had them in my baja and they were awesome, gained 2-3mph with exhaust and stepped up to a 25p mirage+ on a 21' 3400lb boat w 454 mpi 310hp

Interesting. I put a set of CMI E top polished headers on my Whippled 496HO and got 2-3 mph on my 25 Rage. I quite like them. Serious mental horsepower as well when compared to the stock black aluminum junk.

I got the boat back from Unlimited Marine in Russell Springs, KY a few weeks ago. John and Eddie did a perfect job. I went with the Dana set, powdercoated blue with polished risers. The only hiccup was a delay in receiving the risers from Dana. FINALLY the weather cooperated last week for a real test. I managed to get 3-4 mph out of just the headers/fuel regulator alone running a 26 pitch prop with 5050 rpm at WOT. I was tickled pink. The boat now will run low 70's easily when it used to take perfect conditions to hit 70-71. I am not going to go with the PCM- I'm happy for now. Maybe a Raylar kit down the road but would need steerin first. I highly recommend the Dana kit!

here is a pic of the motor
 

I'll try again with the picture link!

http://www.flickr.com/photos/4139722...n/photostream/

And the boat:

http://www.flickr.com/photos/4139722...n/photostream/

Cumberland,
You have a beautiful Heat. I think it's the prettiest Heat I've ever seen. I drove it at the Nordic Regatta before you bought it. I like the new smoked door and hatch, and power bolsters.
Nice upgrade on the motor. :drink:
Are you running the Thunder Run? I'm thinking about it.............
Regards,
Steve

Thanks, Steve! I appreciate the compliment. Ironically, the Thunder Run starts this year from Grider Hill, which is where I dock my houseboat. Unfortunately, I will be out of town on business that weekend. How does your boat run with that 575? I'd bet its wicked fast!