I have a stock 2002 V6. I had a series of "check engine lights", which I had fixed, but now got a new one and repair shop tells me I need new catalytic converters. Apparently the previous problems caused my cats to burn up. Its gonna cost a lot, because I think they want to replace the whole Y pipe and all 4 converter. My question is: Can I have a new pipe fabricated by a shop and replace the 4 stock cats with 2 aftermarket cats instead? Any experience or knowledge anyone wants to share is welcome. I searched around, but only seems to find info from people wanting to switch to dual exhaust. I don't want to swap to dual, just want to fix the problem as cheap as possible so it runs right and I can sell it soon.