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had them, wanted more sound so went to straight pipes...but now I am back to the 40 series. People complaine about drone, but after the straight pipes, this thing sounds close to stock. Two thumbs up to the 40 series. Sound deep and throaty
I bought a flowmaster 40 and decided to return it. I drove around a few days with out a muffler until I put the flowmaster on. I drove around the block and went back to no muffler. After driving around with out a muffler and then putting the flowmaster on, it was like going back to stock. I love the straight pipe!!
this is my second set, first on an 02 6cl,now an 06 5.4 l i consider it to be a mature sound. along w/ my airaid cai & superchip and especialy since removing the airaid tb spacer.