Rumble,I'm using the Rattler on my 408, Used one on my previous 505 and stayed with it. I did try a prw on the 408 during build up to try and save a few $ but had to have the hub honed to fit the crank and then found out it's to thick and offset the crank pulley to far. Now it's in a box (never run)on a shelf, and I'm never changing from the rattler. BTW you can have it if you want to pick it up
