Original post by: davejones ,
on cat acerts (mxs, nxs, bxs) i would recommend the VVA delete tune done by: [http://truckecmtunes.com/|CAT DPF CGI VVA ECM tuning] i've done all my trucks with them, and i just can't tell you how happy i am. on my mxs, once i loaded the vva delete tune, we unplugged diverter valve solenoid, oil pressure sensor on IVA and backed off VVA's. power is great, no issues with vvas any longer, and i gained apx. 3/4 of miles.