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kool pics,,ive seen a few tri carbed polys,,,never noticed the exhaust ports being different,,,,,so i assume you need the exhaust manifolds if purchasing a poly ??

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The stock 318 poly exhaust manifolds are pretty awful, but yes you will need them unless you want to spend $800 or so for the TTI poly headers, which have 1 3/4" tubes; I'm no expert but that seems awfully large for a 318.