using a cat makes you faster?

[DjSpecter]

Well I finaly put a cat on my cat after it was hacked off by a stuid decision nad I can SURLEY say i felt a major diffrence then running stright pipe. I feel alot of acceleration come back and i feel like I actully got just a little bit MPG. Why is that? I mean I thought stright pipes were good? Im mean I stuck with small but good diameter piping 2.25 inch. And ALOT of theraspy noise went away and its just a settle low tone.

[mooreofit]

backpressure in your exhaust helps with low end torque. but it will hinder high end horsepower.