The Synapse UICP retains the OEM turbo discharge pipe and maintains
the OEM boost-only source fitting to connect to the wastegate for a
much more stable boost control source. Competing designs require
elimination of this crucial component requiring the use of vacuum for
wastegate and boost control. This leads to potential variances in
overall system performance. The OEM wastegate's diaphragm is not
designed to take vacuum (negative pressure) and can lead to diaphragm
failure and a system vacuum leak that will be difficult to troubleshoot.
Fits: 08+ EVO X
Part# 16709