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I had my pad replaced at 80K miles when the engine was out. Within 20K miles, with the engine back in, the rear facing edge started to exhibit cracks. Also the thickness of the pad makes it hard to service the ancillaries on top of the manifold below it. If I was to do it over I would find a thinner aftermarket pad. I ended up making an edge finishing strip out of a drywall edge cuff painted black to clean up the look of the pad's edge.
Also if I was to reinstall the OE pad I would add a cutout section above the idle valve and the Varioram actuator to the top left to add some clearance for servicing these items.
Another pretty cool option is the Pad Keeper made by David Etter. I just replaced my pad with an OEM one but the first sign of sagging I'll pick one of these up. When I checked with him a few months back they were $159 with free shipping. I know that there was also a prior post a few years back for a group buy.
Addressing this deteriorating pad while engine is out. Going to use old pad as a pattern and have ordered a roll of Dynamat Hoodliner (32"x54") - $58. Original overall is 45"x26". Will report back after cutting and installation.
Another pretty cool option is the Pad Keeper made by David Etter. I just replaced my pad with an OEM one but the first sign of sagging I'll pick one of these up. When I checked with him a few months back they were $159 with free shipping. I know that there was also a prior post a few years back for a group buy.
Drove the Air-cooled for 10+ years without the engine compartment pad.
Loved having it removed.
Easy to remove.
A Little more exhaust note comes in.
Cleaner engine bay.