Quote:
Originally Posted by westpak
I checked with Stillen and they feel the gaskets are not needed between the cats and headers, the stock system doesn't have them either but their fit seems to be more of a slip tight fit than the Stillen are but we will see, should be good.
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There may be some mis-communication going on here. The stock manifolds and cats do have a gasket from the factory. Last I heard from Stillen, they were saying re-use factory gaskets at the header<->cat junction, whereas Berk supplied aftermarket graphite gaskets (very different than stock) with their HFCs for the same junction. I used the ones from Berk in my install. There's no way that interface is supposed to be gasket-less. It's two pipes mating at a flat junction with 3-bolt flanges, there's no overlap or slipfit involved.