Originally Posted by
velociabstract
I've had both on my car and prefer the 178 crank pulley BUT the installation is a bear/expensive/problematic. The supercharger pulley can be swapped on or off in 15 minutes or less which is a huge plus. The 178 makes more power than the 65mm pulley but it's close enough for some to call it a wash. The 65mm pulley is the easy button. I switched to a 178 with the PSK because my 65mm started rattling like a snake and I knew it would explode sooner than later.
Les
After 2 failed 65mm pulley's first 1 lasting 2 years started then started to rattle like Velocialbstract and the other lasting literally less than a month with the snout of the pulley literally separating. I went with the 178 from Needswings, in hindsight if I had to do it all over again I would have just done the 178 from the start.
The downside, the SC pulley is much easier to change as with the 178 I had to use an air impact wrench to take mine off, they say you can do it manually with a breaker bar but I gave up on that idea 5 mins into trying. Hit it with my cheap craftmans air impact and this special 28mm impact socket and it came off in 1 min.