Been down this (similar) path.
TRUST ME, DON'T go with the Drager on the N/A in my opinion. I don't know about loudness (it's VERY deep and mature on the turbo car...) but the PERFORMANCE would suffer, I'm almost 100% ESPECIALLY on a stock N/A!
I also did a "Sport Brand" exhaust on my '87 N/A Supra, and it was LARGER than the HKS SPORT exhaust and CHEAPER, but it sounded LOUD and obnoxious, and had a TERRIBLE flat spot I couldn't fix. Then I sold that to a cousin, and paid for the HKS SPORT for the N/A. WOW! BIG difference, GREAT throaty sound that was MATURE yet SPORTY, and it REALLY IMPROVED the performance, even with a couple mm smaller dia. piping. NO FLAT SPOT and MUCH better off-idle and in neutral/ON-THROTTLE transition.
I'm a KNOWN HKS biased fan, but their products are quality, they work, and you won't regret a couple extra bucks once it's spent and you are happy with the car.
My $.02
G/L with whatever you choose!
-crisp