I agree with you 73TA; it would be great to see a test and I am betting that we can eventually find some folks to test this system with the new Try-Y headers.
I have heard this 17276 Ultra-Flo on a Firebird and I have heard the Flowmasters, both versions, on another Firebird and I can tell you this one sounds like the Ultra-Flo 17288 (9?) mufflers recorded on the Silent Power CD. With the X crossover, I am betting it will sound exactly like the 17288 (9?) mufflers on the CD and on Dad's car except a little louder at high RPMs since each flow path has only half the volume of sound absorbing material.
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Tom Hand
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