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I know some folks switch their stock 2165 pipe to a 45slp version.
Are these the same length then "as-stock"?
I know MW will supply straight, pre-filled leadpipes - they're presumably stock length and not longer (for the customer to trim)?

Just wondering...

If you want a new leadpipe for your MW2165, you need to let them know what version you have. There have been 3 different valve sets over the years. The leadpipe bends and lengths have changed over the years, too. It would be best to have a picture and serial numbers (valve section a mpc receiver).