Cummins724
TDR MEMBER
I tried SW2,4,6,8 with the quad box while towing & there is a improvement in overall towing performance. The 35hp setting is timing only & it works very well with the fuel only setting of the Smarty, but doesn't seem to gain any power over the quad box alone. The 70hp setting works great, but too much smoke & egts are 150-200* higher although the overall power is awesome & the increase is felt through the entire powerband. It does stack well, but I still prefer the smoothness of the quad box alone.