What is the difference?
Can u put some DC Racing headers on a 08 Scin Tc?

The racing headers do not have a place to put a AF sensor so it will not be street legal if you need to pass Emissions and your Check Engine light will be on.

No and they would serve no purpose either.

yes u can put one on an 08. l have a Strup Header on my 07. Basically the difference is that on Stock it has a CAT & on the Racing ones they do not have a CAT which leads to the emissions problem basically the second O2 sensor does not sense a CAT which makes the CEL light come on, u can get rid of that light by getting a Fouler put in on the 2nd sensor. l also believe that the tubing is wider on the racing ones. They do serve a purpose too, it does give a noticeable power gain.

Ok l will only say this from experience. There r many things u can do to try to make a header pass a inspection station ODB2 inspection. Most obvious is taking ur header off & putting the OEM manifold back on with the O2 sensor. There is a risk even with using plenty of anti seize of the threads getting messed up in the cheap metal manifold & even cheaper made O2. That sensor costs $185, l tried the ones u have to cut the connector off ur original & they still throw cels.
My gas milage went from 30mpg to 18mpg yes that bad. And yes in the city & back roads it was 15mpg. l hear the Street racers out there saying ''dude u need to buy a fuel management system''. l say dude, l work from 7pm to 7am the only street racing l am doing is to work & back, l am not paying $400 for a fuel management system just for a header.
Do what ya gotta, but by all means keep it kewel, keep it safe, & keep it rockin in ur TC, drive on in style man. l do still have my CA l never throws anything & still has good performance gain along with my Fireball strait through exhaust.