Timbo,
My HY is in good shape, I installed a set of RV275's this weekend.
With the XZT+ and the RV275's I'm worried about running to high of EGT while towing. The truck runs good at the 65hp setting with the RV275's.
An EGT gage is next. Most people I've talked to think an HX would be fine with these 2 mods. What condition is your HX in? Iam interested.
Chuck