The exhaust gas can not get inbetween the two tubes until they dump out into the flex section. The turbine side is a uninterupted mandrel bent 2" pipe and the wastegate is a semicircular tube welded onto the turbine tube. We do not back purge to control costs so you can see some oxidation inside the turbine tube. If you are anal about how smooth the inside of the pipe is you can run a flexible ball hone through it.
what you need to do is get the cobra with the divider because you have t25 and when you get the t28, you simply cut the divider.
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