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9905scc Projrx7 004

The stock downpipe (which contains a small pre-cat) is restrictive and retains heat in the engine compartment. The pre-cat also tends to deteriorate and clog, making the restriction worse. The M2 downpipe makes a huge difference in performance.
Mazda RX-7: Part 4

 The stock downpipe (which contains a small pre-cat) is restrictive and retains heat in the engine compartment. The pre-cat also tends to deteriorate and clog, making the restriction worse. The M2 downpipe makes a huge difference in performance.  View Related Article

 

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