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"That sound you love" is most likely the turbo you are hearing. I know what you're talking about, kind of a woosh noise from the pipes. That a result of the excess exhaust presure, something you will not be able to produce. Those tips are designed to cool the exhaust gasses before they leave the tail pipes. If you look further upstream you will see more inlets. Its to draw fresh cool air into the mix. Without this deisel exhaust can actually get so hot it can start fires....
Thanks for your comments guys. LOL
I know why and what they do and with the Whipple got the pressure as well.
If you haven't had a chance to listen to how they sound it's hard to explain, it's more "jet enginey thrust" sound, for lack of a better discription.