I picked shortys because my wife wouldnt let me buy longtubes LOL but honestly I found these BBK on eBay at a price I couldnt pass up, and eventually I will buy the Solo High flow cats to add to. I have a Corsa catback exhaust.
I heard the same...Our manifolds are pretty decent, it's the pipe reduction from them going into the cats that is the issue....that, and the fact that our exhaust doesn't flow perpendicular to the cat substrate. It hits it an an angle.
Maybe the Camaro's dump into a larger pre-cat area then our G8's?
But I think our pre-cat pipe diameters are 2" with the initial internal reduction ring being 1 3/4".
These would be great with Solo cats, as this would remove all the small neck-down areas and keep it all 2.5". But then, you'd be better off getting Kooks mids for what you'd spend on these BBK's and Solo HFC's.