Originally Posted by Intra

Because of the exhaust, you will be putting out higher "engine loads" , no changes to AFR should be needed to your particular stock ecu.

All you really need to do is rescale the load axis on the lo det fuel map, hi det fuel map, ignition maps and ignition correction map (maybe MAF sensor scaling). After this things should be quite sweet, i would say remap would be best bang for buck.

If you are more for the whole ecu thing.. go motec and do it once.

Pete.