ceramic coating
 

is it worth it for me to get my manifold, turbine housing and dp ceramic coated? btw its a 500r going on my hbp t2

to lower underhood temps and cause an increase in spool at an earlier rpm I would say it's worth it.

how much more effective is it than heat wrapping it?

you know I've heard they are comparable however the heat wrap is more of a temp fix where ceramic coating, if done correctly, is permonent.

You can coat them and wrap them.