With my stock 502efi I saw low 60's.
I've got a completely different story with my 502efi whipple. I'm runnin' mid to low70's with a full tank and 4 people. I think once I get it tweaked in with the right prop and fuel leve ect... I was told I should get upper 70's to low 80's.
The Whipple is giving me, I figure around 625 to 645. I've done some other mods, like zero gap rings on pistons, crane HP gold roller rockers. Stainless marine!!!
I LOVE the boat!!!!!!!!!!!!!!!!!!!!
Its a lot of money for a 575!!!
Twin 350's will get you mid to low 70's , but I didn't want the hassle of maintenance on twins. You have a HELL of alot more room with one BIG BLOCK in it, plus the weight difference.
I'm not sure about the fairing?? I've never asked anyone.
It handles rough water like I've never seen for a 29 foot boat. It lands flat when I launch of a good ONE!!! I NEVER use the trim tabs unless I have more than 4 people in it. I think its all around good boat.
I know everyone has their own opinion. Also the 29 scarab hull has been around for quite a few years and proven itself in the rough stuff!!
Godd luck on whatever your decision might be!!
This just my .02 cents worth.
I have pictures of it in the scarab section!!!!
