I just bought some pulleys for my 575 from a fellow OSOer. 3", 3.25" and 3.5". I am looking for a proven calibration using one of the smaller pulleys to pick up a little power. I do not know which ECU it has and it is at the trim shop right now and can't look, but I have MEFI burn software and assume I can install the tune myself. I was offered the ASM tune, but that scares me. This is a bone stock, 05 model with 40 hrs on it. I plan on putting on the Whipple chiller in the winter and upgrading heads and cam at rebuild time, but for now just looking to get over that 70mph hump.

Thanks, Joe

If you have mefi burn, invest in a AFR and hit the lake. You can tune it yourself.

I have 2 AFR setups, but no bungs in the headers and not really wanting to weld bungs in just yet

Tyler Crockett

I would call Mark@ Precision Marine, always hits the mark for me.

He said he wanted a good tune.

Mark @ Precision did mine. Good turn around and great to work with.

Mark @ Precision does good work but WILL lock your ECM. So if you have hopes of dialing your ECM's in further like I did with my MEFI burn, it won't happen.

Sorry, didn't know you had a beef with Tyler. I will research your dealings with him next time.

You may want to reconsider using the AZSM 575 tune. I have never heard of anyone having any issues with that particular map, as the 575 was a common package and it was ran on the dyno by AZSM. It was not one of their mail order best guess tunes...those are what you need to beware of.