i'm assuming no matter what route i take with the exhaust, the gains will be very very similar no matter what company I use... As long as it's not made as cheap as it's price is, which I hear it is pretty good quality, then I'm fine with it.. I just don't want it to be falling apart a year from now with rust and cracked welds...
Also, I will get a CEL with the test pipe correct? So do I spend more money and get one of the test pipes with the CEL fix thing or is there a cheaper method I can go with?

 

Get the perrin O2 cel eliminator. It's like $50 bucks.

 

Why go splicing wires guys? All you need is two spark plug anti foulers (one drilled out with a 1/2" drill bit. Put the drilled one on the O2 sensor, that one and the O2 sensor into the undrilled one, and bolt them back into the OE bung. No more CEL's for less than $20. But better yet, no cuting/soldering your wiring.

This suggestion is for use on off road vehicles that may never be used on public roads. Persons removing catalitic converters from modern vehicles used on public roads will be subject to heavy fines, and may be confine in jail.