[Silverbullet]

There is a whole thread on GT2871R's. It is a little convoluted being how ever many pages there are now, but long story short it is praising the 0.64 GT2871R for up to 400whp with the specific supporting flow upgrades.

On a more typical OEM manifolds and cam setup, you're looking around 350whp with the 2871R. You can always dial it slightly back for a more conservative 310-320whp. It will be slightly laggier than the 28R and 28RS, so that is something to consider.