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Hi all just finished conversion on my surf seems to be getting bit to hot, has new water pump new 16" thermo fan & 3 core ally rad and hoses & thermostat so basicly everything is new,problem is it gets quite warm travelling down highway at 100 kph (100-110 degrees C)but sitting in traffic and...

Gday all i have a couple of questions to ask regarding my 1uz into 91 surf going to run twin 2 1/4 into 2 1/2" single exhaust 1.do i have to use two cats or can i use a y pipe and use a single cat 2.do i have to use the sub o2 sensors any info would be great