The 40 series Flows (2 chambers) resonate bad inside the cabin, but that is what makes sound the way they do. They are fine with cats, but w/o cats they can get annoying if you aren't a 16 year old kid. If you plan on removing your cats down the road, go with the 3 chambers (force II.)
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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