anyone ever hollow out their downpipe? Options

[match220]

I'll be running a 3" high flow cat with 2.5 reducers on each side, I just noticed that the stock Gen III 3sgte downpipe has a cat built into it. I know some downpipes will kill drill bits and others you can pound out with a hammer if you spend a few hours..lol. I want to hollow it out though, are the downpipe internals hard to gut?

[match220]

your car, your call, but i don't agree your smashed out cat is better for performance than a well crafted 3" downpipe (ive had both)

so choose what you like for your car, but maybe leave your personal theory as that instead of parading it as fact??

match, do some research.
the cast elbow and large opening for the cat material are horrible for flow.
all the velocity is lost in the cat section, which is what you want, velocity.
a well made 3"downpipe will make more power, everywhere, over the stock downpipe, blitz upper section + stock lower, or any 2.5" dp.
its been proven, over and over. there are dyno charts where the testing has been done, so before you get your panties all in a bunch, i suggest you know your facts.

These are facts, it's thermodynamics, the foundation for a lot of what our physics are based off of....density. They aren't personal theories or things car nerds type up that others find via google. They are good things to keep in mind when building an exhaust system.

And as far as the DP flow, I have to suck it up and agree now that it won't be as great as an aftermarket one. When I was at the car yesterday I noticed all of the bends inside of the two DP sections(mainly the upper half), and how it gets larger and smaller and changes from square to round and round to square. This will disrupt flow and keep it from being as smooth as I would like it to be, but I will save the money and keep it since it's what I have. Thanks for the comments though guys. I'm not mad, and I hope that isn't how I'm coming across, I know that's how it seems sometimes when there is just text and no voice tones.