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No pre-made setups for the Bonneville so you'll have to piece a system together. What kind of exhaust are you looking for? Cat back? Or do you want to replace the whole thing?
 

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You won't need to replace any of the pipe as it is all 2.5. If you go to anyplace that does exhaust they can get you what you need. Try justmagnaflow.com for prices on Magnaflow, or else go to Jegs(or a similar site).
If you want even better flow replace the stock manifolds for some ported ones.
 

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Nope, as I said the piping is 2.5" which is plenty big for the L67. You would just need to replace the cat and muffler.
IMO the biggest restriction is the manifolds. For the money-to-power gain it would be better to replace them for ported manifolds or if Santa is really generous, headers.
 
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