GsLex02

I going to be replacing my mid pipes on my Gs300. I have been looking at some L-Tuned B pipes and also the Megans Racing Downpipe. Whats your guys thoughts on the mid pipes...Ive read they dont do much but my 3rd cat is bad and my OEM midpipes are rusting at the flanges so I want to replace them. Any reviews from CL members who have done exhaust work? I have brand new headers and first 2 cats by the way. Also resonators are removed with straight pipe.