CSA, when you said peaky moment...I'm guessing you are referring to the turbo respond or boost in period, correct? if you do not want to have lag choose a suitable turbo for the engine capacity. There's lag when you put a big turbo onto a small engine because the engine just can't create enough exhaust gas to spin up the turbo to create boost. What you need is a small turbine that can react quickly and able to spin the compressor wheel fast so to create boost. You need to look into the A/R ratio of the turbo.