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It's a BIIIIGGGG improvement over most anything for the C5 if you're willing to cut the tub's hump. The C6 Z06 exhaust is full 3". The reason the tub has to be cut is following the over axle the mufflers were mounted straight and vertically, unlike the L and horizontal mufflers the C5 has.In most cases a lot cheaper too than trying to pay $1,000-$1,400 for JUST a C5 cat-back.
