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C4, the guy above your post explained it. If you dig around on tech theres a thread on it somewhere.
The original thread was deleted, the shop is a non-sponsor. If you look on the last page of this thread, https://ls1tech.com/forums/suspensio...-camaro-6.html, I compiled a list of all the IRS threads I could find. Also posted 1meanz's car from thirdgen.org, and the GMHTP article.