Manifold/header/muffler/tail Pipe problems of the 2008 Suzuki SX4

After taking my Sx4 into kipo motors for inspection and check for rich fuel and ticking, it passed NY emissions but I was told I needed a $2000 catalytic converter and not to worry about the slight tick. With in 6 months my engine blew up well driving to dinner with my family in the car. Flames shot out of the hood and other drivers reported flames pouring out the bottom of the car after it exploded. Kipo/Suzuki replaced the engine, after assembly two cylinders didn't work. Kipo never heckled any other parts and had to rebuild it again after they found the valves broke causing the engine to explode. Now the car has no power and at 2084 miles on the new engine they say the catalytic converter is stoping the engine from working and due to the closeness of the warranty end they are not going to fix it. The engine exploded in the front. There was a hole the size of my fist in the block behind the catalytic converter. Chunks of the engine block were in the exhaust manifold as well but they say none of this is a result of the engine exploding. I have seen others with the same rich fuel and engine tick and wounded are these ticking time bombs?.