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Discussion Starter · #1 ·
Greetings to all
I purchased axle-back mufflers and X-pipe from a 2011 ZR-1. Originally intended to have only the mufflers installed in my 2010, base, 6MN Coupe by having the shop mate these to the stock 2.5" LS3 X-pipe. I am contemplating installing both the mufflers and 3" ZR-1 X-pipe, mating same to either the 2.5" LS3 X-pipe or down pipes. Some have suggested adding the larger diameter X-pipe might add HP/torque, while others claim it might lose HP/torque.
I would greatly appreciate opinions.
 
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