Nobody ports a head to stay on stock turbos.If this is on stock turbos, then thats pretty impressive, as you're essentially making FBO power at stock boost levels. Which is good for longevity, or you can now turn it back up to 18 psi and run it even faster. Right?
Was there any top end gain after porting on stockers? Or does it still nosedive after 5.5K?
Why ? Because the power limitation caused by said turbos.