i have the dynomax cherry bomb\glasspack. its pretty good for $20. it has a strait through smooth core with no scoops or louvers just small holes. most peopel say the dynomax superturbos suck but i want my car to be a lot quieter. i had one on my car before and it didnt seem like it was too restrictive. it will probally keep the sound level down when i remove the main cat. im guessing no cat and a superturbo will flow way better than having a cat with just straight pipe. anyone have a different opinion on that?