It works with stock manifolds. That's the way I have it on my car.
I am not 100% sure it is the Leathal X-pipe. Mine is all in one piece, no clamps or welds. Might be an older model or a different brand.
Make me a good offer.
Is it stainless steel or mild steel? I may shoot you a PM, talking to a local guy about getting a deal on a tuner but it may be falling through. If I get the tuner I will PM you.