Welcome to the ORG.!
OBS is our old body style trucks.
The problem with the OBS trucks is the factor injectors are too small. You can get some smoke with them, but not much. If you have a good intake and exhaust, you will probably not see any. You can get a custom chip which may give you what you want. I recommend going with a Tony Wildman chip and look at Rosewoods' DIY injector upgrade.
then you can do this:
