06-01-2015, 08:37 AM
Sorry don't know what a buttress is or does,if I under stand right 688 and up had EGR which caused the poor mpg what was the mpg before 688 and after. what about the 525 Cat with 6 speed mpg and the 600 Cat ? Is it better to have a 6 or 10 ,12 speed I was told it is hard to find some one to work on ZF trans and not as smooth as 6 speed were they right what about Cat cost to run compared to the 60 ? What is the advantage of the Spyder system if any compared to the old system ? 686 would have ZF just no steer and new brand slides I assume not HWH ? Is the rear steering worth it, any thing else ? Thank You all for your help so far.