JARblue

Aren't the non-Nismo exhaust bolts tack welded just the same? You should be able to beat them out with a hammer. Five or six solid blows with a small sledge should do the trick. Set the pipe in a mounted vice and close it (not too tight) to where the flange is sitting on top of the vice. Hold the pipe securely in one hand and hammer away with the other. Goggles for safety.

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