I plan on making an exhaust for my car. The plan is 2.5in pipes from the headers to a dual in dual out flowmaster mounted mid body. Then 2.5in pipes to the rear and an X-Pipe after the diff., under the bumper area, then two pipes out the back. Everything is fine except the backpressure problem. Since its going to be catless I'm worried that the flowmaster won't make enough backpressure for the low end torque. I picked a flowmaster for the sound and the flow through them. Since they are on the restrictive side I'm hoping the pressure should be enough to offset the loss of cats. Any opinions on this?