FLOWMASTERS!! Are there 3 kinds of 40 series 2 chambers??

[Moxie]

There are two types of 40 Series (2-chamber): Standard and Delta Flow. The Deltas are Flowmaster's "new and improved" design. The scavenge exhaust gases a little better than the old style, so there's a little more torque. The biggest difference, however, is that the Delta Flow's have about 30% less interior resonance than the old style.

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Moxie Racing