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longtubes are better overall if you have a built engine but shorties are good for some low end, shortys typically bolt right up but longtubes require fab work because, well, they are long
I just got done installing the 1.7 there is defiantly a power difference in the mid to upper rpms I made some vides I didn't have a good launch on the run usally it will sqeel and take off like a bat outta hell