The kits come with all of the parts to hook up to the existing Cat-back exhaust system. I left my Borla cat-back system in when we did the install. As far as upgrading the kit later, I'm not 100% sure. I personally have not seen a stage I kit, but I have seen the Stage II, IIx & IIxx kits up close and installed. It might be better to speak to Joey at www.jadeperformance.com since he has more experience installing them on 4.6s than probably any other independent shop.
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99 Silver GT Auto
DTA Built Engine w/P&P heads, TDC Turbo (T-76), Built 4R70W, PI Multi-Disc 3200 T/C, Eaton 31 Spline Carrier, Strange 31 Spline Axles, Aeromotive 1000 HP fuel system, 66lb injectors, MSD DIS4, Accel DFI Gen VII & Mac 3" cat-back.
Built by Jade Performance
Best on Nitto D/Rs
11.698 @ 120.898 @ 12 psi (built block)
Best on Slicks
10.922 @ 122.95 (stock longblock)
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