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I'd go for the multi layer one.. not sure why but I trust it more than a single one.. These heavy metal parts may not be perfectly flat and I think the multi-layered one could help with that. I use the grimmspeed multi-layered on manifold to head and never had any issues. I'm also using a single crush on turbo to manifold and also haven't had any issues.
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GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways
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