Hyundai

just want to ask all sifu,

the reason you install exhaust temp is too see the exhaust temp right? but what if
the exhaust temp goes up like hot from the manifold to muffler..not just hot but freaking hot until the cabin inside can feel...

what can be the problem?

A/F ratio? have not check yet
tuning? looks good at 900 rpm
o2 sensor malfunction? don't know
or wrong pipe? 1.6 single cam non vtec head 2 inch after...