I fitted an N55 mid pipe this last weekend, luckily I'd purchased 4 new flanged nuts.
The lower two nuts were pretty much seized after 11K miles and 14 months.
We ended up chiseling them off. The thread looked to be M8 X 1.0 or 1.25 (didn't need a die so didn't establish exactly what it was)
The top two nuts which hadn't been exposed to road salt and water, came off with no problems.
The studs will be a press fit into the downpipe itself (and hence aren't listed as separate part no) possibly with a straight knurl to make them an interference fit.
Last edited by Dirk Van Driver; 03-13-2013 at 01:30 PM..
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