you mean the part starting around 3:46 ??
to me it sounds rather been DOUBLED by a (somehow treated) piano-ish sound ...and maybe only on the accentuated (sp?) higher notes...
would be my first guess
otherwise I could imagine a parallel effect bus (hey, it´s m.brauer !! ;-), with something like a strong comp + ringmodulator + delay/verb added to the main track...
....but it sure sounds like his normal tele underneath
anyone can shed some light??