Thank you Joe, I found that thread.
I am going to do the same. I often rev the engine near red line, it'd better do cutoff at 3000 rpm, I worry those fans may not be able to handle 6000 rpm, and the noise is really loud at 4000 rpm, like a air cooled 911 turbo.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.