these look pretty good, they have either 4 or 8 different settings depending on the model. pretty expensive though 120 a piece. So does anyone know anything about these (if they suck or not)? anyone have some?

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-Stock Tbi 305 with a lot of damn miles
-Edelbrock Z28 TES Headers
-3 inch Catco High Flow Cat
-3 inch Edelbrock Catback

Stereo
-Pioneer DEH-P4100 cd player
-Polk Dx9 6x9s