Originally Posted by D-Rodman
My ver 8 is going in tuesday, planing on using the stock downpipe, stock ecu, stock airbox, stock turbo inlet but will be using an aftermarket 3" catback. Will be using 93 octane fuel, will I need the ecu remaped or will it be safe to daily drive ? would using a stock usdm wrx catback be a safer way to go ? Thanks.
Yes you need a remap. The JDM tune uses aggressive timing that will knock on 93oct.
However this issue has been discussed so many times in this thread, that it is so surprising people still ask this question...