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'05 CTS-V
9,367 Posts
Discussion Starter · #2 ·
I found the Fastrack News that added the CT4-V BW for T2 - May Final TBs 04.13.pdf

Allows up to 18x10/11" wheels (f/r) with up to 295 width tires. Says "Suspension and engine components must remain OE or OEM unless noted below: ECU and all other computers must remain unmodified and must utilize OEM programming unless noted below. Carbon Fiber package RPF-PFZ allowed. Rear spring allowed #84004133. eLSD Calibration permitted." I looked up that rear spring part number on a couple of the GM parts sites and both came up as "discontinued" with no information about what it is. Any ideas?
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