One way to find out--may want to setup an engine temp sensor to monitor before and after mods results. Pvc is cheap so finding out is easy. Watch plugs after mods to unsure no internal overheating you could not see with the temp monitor/s.
Oven temp monitors are cheap at mall kitchen outlets. Some have multiple thermocouples to monitor more than one location.
This may also help with the loud air intake /cab situation at lower speeds I've noticed.