[757Fixer]

When I say dual tip I am meaning per side, if that is not convention, it is what I am used to. If, as you say, comparing a single outlet per side suitcase OE muffler with a Corsa S single outlet per side muffler setup reduces weight by 10-12 pounds, I am simply guessing that comparing a stock dual outlet per side setup with NPP to a Corsa S dual outlet per side with NPP will reduce weight by perhaps 8 pounds. My exhaust is stock.