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Hi Mark-HD,
We can't speak to anything regarding another company's products, but we can tell you why we reccommend cutting the bumpstops in our procedure. Our Pfadt drop springs provide a 1.25" drop approximately. As a result of this change in static ride height, the usable region of the damper travel is offset, to be approximately 1.25" lower. The Camaro has a very limited amount of bump travel to begin with, before contacting the OEM bumpstops. We recommend to trim 1" from the bumpstop in our installation procedure to give you back that 1.00" of damper travel, that is not influenced by the added spring rate of the bump rubber. We leave some bump stop in place to give a rising rate on big hits. This conclusion was made from testing, and experiencing the same bump characteristics that you mentioned. This of course, is just our position in regards to our own product installation, and I thought it was relevant to what you were asking. Hope that helps clarify the difference.
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