If its a popping noise, and assuming its around 4500 - 5000k, your engine is missfiring.
What u need to do is replace your sparks plugs, but get them gapped down from 1.1mm standard, to 0.8mm (this just makes the spark stronger as is doesn't have to travel as far). Also, if you still have the problem, you will need to look at replacing your coil packs. Splitfire is the way to go, check out Slide Performance.