Didn,t have the chip, and knowing what I know now about the ZD30 if it drops power or something changes in performance, ie increase in turbo lag when changing down. Have it checked out, just keeping the boot in will do some damage. By the way I was quite impressed with the X Country 4x4 aftermarket intercooler, have bought one and will be interesting to see how it performs. Also Intercooler kit includes dawes valve witch should protect from over boost when I block the EGR valve.