i dont bother gasketing the exhaust after the turbo, i use CRC maniseal, since most exhaust flanges seem to be made out of 20 year old warped barbeque plate, 90% of gaskets are going to leak in the end anyhow.

your best bet is to get as stiff as possible with the exhaust hangers and ensure the exhaust is well supported to minimise flex and movement in the system, this will stop the flanges bending open and blowing the gaskets out.

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Long live the WRC