With My Turbo 1800 on a single-stage colorado- I had to go to 15deg to get the best performance (Southern Jet Bullet)
Around 200-210 realistically based on an NA base hp of 140 at 5200 rpm so with 8 pounds of boost that would equal 216hp: (140/ 14.7) x 8 = 76hp plus the NA base of 140.Never quite hit 5200 rpm but got close.Hit 78 kph on a lake with full fuel 3.4 Westlander (very heavy for size)