I put a Pypes system without mufflers and bought separate mufflers (Dynomax Super Turbos) on my brother's 1970 last year with SS band clamps and the system was excellent.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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