After all, too much of good thing is sometimes still too much. The tuning wizards at Chevrolet set a delay for the direct fuel injectors to encourage a few extra burps and pops on overrun, but only while your foot is moving the throttle. The firing order and exhaust header design go a long way into explaining the unique exhaust note of the GT350, there's more than simply it having a flat plane crank. The result a Ferrari-like scream, but with a somewhat deeper tone. The GT350's firing order is 1-5-4-8-3-7-2-6, while Ferrari uses 1-5-3-7-4-8-2-6. Like other GM offerings the Z06 has an active exhaust which can be anything from crazy loud to stealthy quiet. Equal-length pipes feed into a unique and highly tuned system which winds through mufflers, stuffed in the corners of the car, and exits out the middle through parabolic reflectors which sends the LT6 engine music toward the Z06's cabin. To get the sound right, a process that took two years, they started with the unique four-into-two-into-one stainless steel exhaust headers. ![]() The hard part with a flat-plane crank is that it can sound like two angry four-cylinder engines next to each other it's a problem that can't be solved with a simple X-pipe or other crossover tube. However, the 360 twin had a mechanical primary engine balance that was no better than a single. ![]() A cool new engine necessitated a cool new exhaust. Main article: Parallel-twin The classic British parallel-twins ( BSA, Triumph, Norton, AJS & Matchless) all had 360 crankshafts that, compared to a single, gave twice as many ignition pulses which were evenly spaced.
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