Mid Pipe Install Questions...

[Formel1]

Ok, pu'd a set of CP-E midpipes. Problem is the y-pipe to the rear section won't tighten any more and leaks. The ypipe seems to have a built in nipple/flare that acts as a crush ring? Am I missing some sort of special crush ring for the same? I've got the springs b/w the flanges completely compressed, and I can tell where the PO had the pipes fastened to the ypipe and I got more pipe (ie, it's already pushing further back). On gas, it sounds ok, but obviously leaks, as idle, it's like someone blowing the edge to a piece of paper with light throttle - kind of annoying...

[denial]

this is just the mid pipe mated to the stock exhaust?

[MadMan77]

You probably need to put the original donut gasket back on. It is part #2 in the drawing below:

The part number is 18117553130 but it runs $33 so hopefully you still have it attached to your old exhaust. It looks like half of a donut. Just carefully slide it off the old and slide it on the new.

[Formel1]

Yes, it is mid-pipes to BMW performance exhaust. I'll try to take it down and squeeze the crush donut in, but unlike stock y-pipe or BMW perf y-pipe, the single outlet to the axle back does have a fixed OD pipe, it is flared like a crush gasket that fills the receiving end of the rear section. There is no pipe to hold a gasket in place, other than just to squash in between the two and hope for the best??

[MadMan77]

That sucks. Metal on metal never makes a good seal. Hopefully the gasket will help things out.

[denial]

of course don't forget the ol copper exhaust gasket maker as well. that thing works many wonders and will conform nearly to any surface.

on a side note, very interested in how this sounds. I was considering this very setup as I think the performance exhaust is too quiet.

[Lester]

You might try some aluminum muffler repair tape.

[HondaGoneRogue]

^^G-h-e-t-t-o