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[FLSTFI Dave]

This has been stated many times. If you use non EPA complaint parts on the M8 motor,  Harley does not and is not required to warranty the motor. These after market parts are illegal to use on a street legal motorcycle. Bud sold EPA approved mufflers, didn't go over very well.  You can do anything you want to the M8 motor using aftermarket parts. If it breaks, don't  except Harley to fix it.

Actually, they would have to show that the after market exhaust is why the cam failed to not cover it.  Most dealers are paranoid right now due to the suit with the EPA.

However the warranty can not be voided unless what was changed could be what caused the problem.  You will have more issues with an ESP than the MoCo

[JC]

This has been stated many times. If you use non EPA complaint parts on the M8 motor,  Harley does not and is not required to warranty the motor. These after market parts are illegal to use on a street legal motorcycle. Bud sold EPA approved mufflers, didn't go over very well.  You can do anything you want to the M8 motor using aftermarket parts. If it breaks, don't  except Harley to fix it.

That is actually a quote from the Magnum moss warranty act not me.

[glens]

The Magnuson–Moss Warranty Act doesn't have anything to do with using aftermarket performance parts.  It's about normal maintenance items.  And in any event, you really need to read the "Consent Decree".  Google that term, Harley, and "Civil Action No. 16-1687".  I'm sure you'll be able to find a copy of it.

It is and has been against the law to modify any emission-controlled product such that it no longer meets certification.  If you do so, especially now with this District Court decree, to a new Harley Davidson motorcycle, you will have no big brother to complain to when your warranty on the entire powertrain is denied.  It has always been wrong for you to claim warranty on an oil pump, crankshaft, or whatever once you've modified the product to produce more power or to run differently in any way, anyway.  The Magnuson-Moss Warranty Act was always about protecting the consumer against arbitrarily ambiguous or underhanded warranties, and against tie-in to using only specifically-branded oils, spark plugs, oil filters, etc.  It was never about making the manufacturer fix something that broke because you made it happen by overstressing components via modifications. 

[MrSurly]

The current discussion is not aided by the repeated citation of the MMWA as it truly doesn't have anything to do with the EPA certification.

The MMWA simply means that they can't say "You MUST use HD branded oil fiters" to maintain your warranty. You can use any brand of maintenance products to *MAINTAIN* your bike. Note that means to "keep it the same" but with fresh products like filters.

If you want to CHANGE the bike, you are outside the scope of MMWA.
The EPA says you can't CHANGE any part that affects, or is related to the emissions system. If you swap mufflers with an EPA compliant aftermarket muffler, the MMWA actually could apply to support your using the aftermarket part, but it doesn't matter, because the EPA stamp overrides MMWA AND Harley on this. EPA has 'blessed' that muffler so HD can't object.

Now, if you want to use a NON-compliant part on emissions parts (muffler,say), it doesn't make a damn that MMWA says it's OK to use that brand... because the EPA says NO, and the EPA mandate completely overrides MMWA.

Magnussen-Moss really has no place in the discussion about the EPA compliance unless you are comparing MoCo EPA Compliant parts to AFTERMARKET EPA Compliant parts.