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if you want to change your turbo to manifold gasket once a month, then by all means use an exhaust that is less than 3" but if you want faster spool, ~10 psi w/out a boost controller of any kind, better fuel economy, and a nice exhaust note then i would suggest getting a turbo back exhaust, ive been through a few turbo to manifold gaskets myself, with a custom mandrel bent 2.5" exhaust and none with a 3" so thats my take on it, more pro's then con's
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