Hey Ken B. thanks very much for the compliment. My Ansa is the muffler. They are not just tips. When you look at the ANSA threads here, you can see the ANSA is actually dual tipped packed mufflers. So that sound your hearing is a combo from my resonator to my ANSA. the 2.8 should still be able to breath well with a 2.5" header. If you find an ANSA with a 2.0" inlet, you can just neck down the pipe (a good muffler shop can do this) to a 2" toward the back. As exhaust gasses cool, they condense, and you really do not need 2.5" pipe all the way to the muffler. In fact, an argument could be made that necking down slightly helps keep the velocity up. I would say that with a 2.8 liter engine that is mostly stock, that is street driven, you will not leave ANY Horsepower on the table with a 2.5" that necks down to a 2". If you told me you were going to slap a big cam in your 2.8, and then run it at 5500-7000 rpm all day, then the story would change.