OEM mufflers from any first-gen DL1000 will fit.
If you go that route, you'll need to pay attention to the clamps and sealing sleeves, which are often damaged. The clamps are spot-welded in place and are a bit of a weak point. However, you can replace them with stainless Mikalor t-bolt clamps.
My Vee came to me with a migraine-inducing 2 Brothers exhaust. Loud pipes on a Vee are especially bothersome because there are two outlets up high and close to your head. Fortunately, the original pipes were included in the deal and soon were back in their proper place.
And yes, baffles and/or repacking those open pipes would definitely help. You can get replacement parts for LV systems, but only through authorized LV dealers.
2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
2005 KLR685, Aztec Red - Turd II.2, the ReReTurdening