pipes won't fit?
No problem. Take it to a good muffler shop and they can add flanges, flares, more pipe, whatever it takes to make it fit. You will not find a system like you are talking about that bolts right up. I installed Hooker Shorty headers on my car. I wanted to do away with the cats, but didn,t want to gut them (have you checked the price of stock cats lately?) so I bought a pair of used cats from a salvage yard took them to my muffler shop and said replace the cats with a staight pipe. The guy said no prob. If you are familiar with the later model cats, they are two different lengths and the left side has two 3 bolt flanges and the right side has 1 flange and the other end is a slip fit. He used the ends from the old cats and fabricated a large diameter straight pipe from the headers to the Flowmaster cat-back. No problem, sounds great, runs even better.