Well above 400whp is very vague. Figure out what you want and then people can help you out. Sub 500whp the 7m is great, much cheaper, and makes the power fine. Above that you might start thinking about building the block, so then the $$ factor comes into play and the price difference between the...
This is horrible advice, do it once and do it right how you want it. Settling for something that isn't want you want is a waste of time, effort, and money.
I wouldn't waste the money on the ct setup if its not going to reach your goals. As I said T4 60-1 will make 500+whp on high boost, and they're not much money.
What spring is in the wastegate and what does it boost? What is your boost controller set to?
If its not creep and just slow acting change the Set Gain to 2-3 psi below your desired boost level and it should come on faster. Also mess with the gain and it should be more responsive.
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