Yes they will, got some of my own. Like Chris said it's a custom job but it seems like I've heard of people modifying the LS1 f body true dual kit to work on an LT1 f body, could be wrong though. Most true duals on these cars are dumped before the axle (like mine) and it's loud.
There is no brand, it's a custom job. Go to yer local muffler shop and get a quote for 2 1/2" pipe dumped before the axle. I payed $130 with aluminized pipe to get mine done at a local muffler shop, I already had the bullet mufflers though. Can't remember what they cost, got them off Summit. Don't let them beat the bottom of yer car up just to make room for the mufflers, there's no need in it!
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