i have the 40 series flows on the 70 & my 86 Cutlass. The ones on the Cutlass believe it or not are not that loud when doing about 60-65. The catalytic converters knock the sound down. It has a nice tone under acceleration. The 70 is a different story, lol. It is loud under acceleration, but the resonance is not that bad inside the car as compared to what I have heard.
Tom
PS
i have a sound clip of the 70 on the yahoo site for anyone to download.
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