[bbazzracing]

What size screws, washers, and nuts do I need to connect the downpipe to the rest of the exhaust?

[TheGoodTheBadTheUgly]

Originally Posted by bbazzracing

What size screws, washers, and nuts do I need to connect the downpipe to the rest of the exhaust?

If you go on RealOEM you can quickly take a look at the exhaust and downpipe setup.

Doesn't seem like there is a part number for the bolts, but the nuts are listed there and have the BMW part number: 18307620549.

The nuts are flange style M8x1.25, thus you could just get matching bolts of a select length and fasten it all. Due to the flange morphology you don't need washers.

Gasket needed is the following BMW part number: 18307553603

There are also hardware and gasket kits that vary a bit from OE design but that are sold from several companies for aftermarket downpipes and work perfectly fine if not better. Just search N55 downpipe hardware kit an you should see a couple options from reputable brands.

[bbazzracing]

Originally Posted by TheGoodTheBadTheUgly

If you go on RealOEM you can quickly take a look at the exhaust and downpipe setup.

Doesn't seem like there is a part number for the bolts, but the nuts are listed there and have the BMW part number: 18307620549.

The nuts are flange style M8x1.25, thus you could just get matching bolts of a select length and fasten it all. Due to the flange morphology you don't need washers.

Gasket needed is the following BMW part number: 18307553603

There are also hardware and gasket kits that vary a bit from OE design but that are sold from several companies for aftermarket downpipes and work perfectly fine if not better. Just search N55 downpipe hardware kit an you should see a couple options from reputable brands.

Thanks for your help!!! Never knew about that website. Wil come in handy for other projects.