If you want it to sound similar to that yellow thing, you need to run tailpipes and stainless tubing. Stainless has a thicker sound, but can be a pain in the butt and wallet to set up. the muffler I'd choose to get that sound would be a Borla, but not XR-1s. Borla makes a round, short muffler in 2.5 inch only called an S type. I've ran them on all kinds of stuff and they sound very similar to that pitch on that ls3. Super raspy and ultra nasty at WOT. Be warned though- folks in the next county will hear it when you let it eat. They don't drone at all with tailpipes.
An alternative and my personal favorite is a Dynomax bullet in 2.5 inch with full tailpipes and an x pipe. It's such a deep, scary sound that isn't like anything else on the market. They didn't drone at all, but snapped a lot of necks while cruising a show. Here's just a little LS1 with a TREX and that exact setup:
I have the stainless piping already. Just need the mufflers now so the shop can bend and weld it all up. I need whatever mufflers I chose to be in stainless also.
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68 Camaro "Bloodline". OZMO Twin DBW LS3 with TSP 231/236 cam, Speedtech frame, Ridetech coilovers, Chassisworks G Billet/Fab 9, Asanti 19's, Fesler brakes, Carbon Anvil everything, etc.
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Since you're so undecided, and who wouldn't be, maybe you could have them use clamps on the mufflers instead of welding them. That way if you don't like them or want to try another pair after this initial pair it will be easy to swap out. Just a thought.
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Trey
Current rides: 2000 BMW 540i/6 and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
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