does any body know or have experience with these magnaflow hi flow cats?. id like to change mine out as before I got mine chipped I was getting an efficiency code. I actually like the standard SE exhaust sound but would just like to upgrade the cats. Does the sizing look right?, just a straight forward weld in replacement?

http://www.ebay.com/itm/Magnaflow-Ex...df38ee&vxp=mtr