I had a major wheelhop issue on my pullied 04 Cobra and I suckered for a gimmick by the name of “Kenny brown rear IRS brace and bushings ” to remedy it. It actually made it worse, not the desired outcome. I researched on the forums and found that 315W Nitto 555Rs on the stock 2004 Cobra wheels was a viable solution, and wouldn’t ya know, 100% fixed.