Well you tend to be presently heading down a bad road. Removing the catalytic converter is not heading to allow the pc go into shut loop, and the O2 sensor is not heading to study correct because of to absence of heat that is specs to operate. Which in return is heading to give you elevated gasoline which is fantastic for a brief phrase gain. After time you tend to be heading to clean out the rings and most likely even burn up up the gasoline pump. I communicate from experience, I have a number of S10 Blazers 2wd and 4wd. I did exactly what you tend to be performing now with my preliminary 1 and subsequent about the preliminary yr started operating into the issue I said above. The 4.3's tend to be amazing motors, nevertheless there tend to be a couple of no no's with them. Adding dual exhaust is another, I have as well tried it and done a great deal of studying about it. You will drop HP and tons of decrease end torque. On my current every day driver, I am operating a higher movement cat, with 2 1/2 inch exhaust into a flowmaster. Here is a video clip of what it sounds like streetfire website/video/my-94-s1... I am as well operating a coldair intake setup (which you tend to be performing the identical with the open up component air breather) Accel cap, rotor, 8mm wires, AC platinum plugs, transmission cooler, 3.73 posi gears. That is fairly a lot it. I am acquiring 20 mpg and have fantastic performance. If you tend to be searching for fantastic performance, swap out the intake, get a TBI off of a 350 and do a throttle physique swap, and a established of headers, alter the rocker arms to a 1.6 ratio established (just as fantastic as a cam swap and you do not have to be concerned about the cpu freaking out) include a superchip prom, get a higher end harmonic balancer, operate synthetic oil. All of the over I have as well done on my 90 TBI 2wd, nevertheless it is presently acquiring a motor swap. Good luck with everything.