what i have found for the best performance gain and sound that still fits the factory hangers is flowmaster. since you have the 305 the sound will be a little different from say a 350 but if you visit they're website, www.flowmastermufflers.com they can hook you up with a kit that fits your car. you could get dual or single out the muffler depending on how much you want to spend.
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'93 LT1 (M29) bbk shorties, switching to Jet Hot LT's over the summer, Jet stg 2 tune, TB airfoil, !TB, !CAT, !EGR/AIR, SLP SFC's & STB, SLP Ultra Z hood and CAI, Flowbastard cat back, SPEC III clutch, more to come...
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