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It's a straight through perforated core with no filling.
You're right about the downpipe. Fabspeed shows a tennis ball test that passes through the entire length of the exhaust but as you may know, a tennis ball diameter is only about 2 3/4". You would be better off with the SFR testpipe. SFR also makes a very nice 3" downpipe that fits on the back of the turbo to make a true 3" all the way through. My buddy has this setup and he loves it. You can even "tune" the sound using different resonators on the test pipe or different mufflers in the rear exhaust.
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Speed Is Intoxicating.
1988 Porsche 944 Turbo S
1991 BMW Alpina 2.7
1995 BMW M3 (Dinan S3 Supercharged)
2005 Mercedes-Benz CLK 500
2005 Porsche Cayenne S
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