there are a couple different downpipes hogan makes for the car. i believe that the magnaflow is 3 inch exhaust all the way with 4 inch tips so you should be good there. on the mufflers im not sure the difference between the 40s and the 44s but the 40s are the loudest.

 

Sorry, guess I'm just not an active reader for your scene. I never knew your downpipe was such a problem like ours

 

Yeah, I don't "see/hear" a problem with it, but some guys believe it's an issue.

I'd love to see a stock downpipe and a Hogan next to one another to compare.

 

i believe that on ls1 tech they have a dyno or two of it but its for the catless downpipe. i personally wouldnt run without the cat but there is supposedly a big improvement between the hogan and the factory. i personally dont know first had cause i dont have one so its all just hearsay.