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Re: 2" or 2 1/4" 327 exhaust? need help/opinions...
I would do a minimum of 2 1/4 all the way out back. My 58' 283 2 barrel has dual 2 1/4 to muffler and then 2 1/2 to bumper. Runs just fine. My other small blocks with manifolds, I step it up to 2 1/2 just out of the manifold. If you run tailpipes all the way out back, they pretty quite.
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1927 Willy's Knight 24,000 original miles, 1958 Impala 283/Powerglide, 1964 C-30 383/4 speed, 1971 Monte Carlo 350/350, 1972 GMC K2500 350/350, 1976 Chev. K10 350/350, 2006 GMC Sierra 2500HD LBZ Duramax/Allison, 2006 Chev. Silverado K3500 LBZ Duramax/Allison
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