[littleblazer]

An aftermarket "Cold Air Intake" should get you what you want...

 

[littleblazer]

There are only a few things to increase turbo suction sound;

1. Bigger intake; the top winner is going to be what people refer to (or use to) as a "hot air intake", which is basically an open intake like INJEN instead of a closed box design.

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2. Bigger exhaust components; more air flow = more suction

3. An actual bigger turbo (self explanatory)

Edit: Just to clarify - the terms like "cold air" and "hot air" intakes are all marketing buzzwords. "Cooler air" just doesn't sound as jazzy right? A cold air intake would literally be some sort of contraption like your home air conditioner that converts warm air into cold air.

Hence why I threw it in quotes in my response... Though I will say, and it is probably the only time I will give them credit for a damn thing, that the "interchiller" or whatever you want to call it on the dodge demon was a pretty cool idea. That was legitimate cold air being put into the intake via the A/C compressor.

 

[littleblazer]

I just would go in knowing that it wouldn't change much else than sound... there isn't a ton left on these in their stock trim. GM did a pretty good job.

 

[littleblazer]

I'd like to see a turboback straight exhaust system. You see a lot of cat backs but if you go from the downpipe or turbo back I guarantee you will get A LOT of sound. Probably similar to a diesel for turbo noise but with a 4 cylinder. It will be loud. I don't know what sensors are running post turbo in the exhaust system.

The cat is pretty much bolted to the turbo outlet... short of gutting that then tuning out all the sensors which seems to be difficult at the moment, I don't think you'd stand to gain a ton. Cats are pretty effective mufflers as luck would have it. If you went straight pipe it would definitely get louder though.