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1970 Ford Fairlane 500 Magnaflow Performance Exhaust Installation

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Back in the day, H-pipes were the rage. The only problem is that fast-moving exhaust isn't good at making 90-degree turns. The X-pipe, however, is far more efficient at doing this. In both cases there's a scavenging effect, but the X-pipe also has great pressure balance.
1970 Fairlane 500 - Magnaflow Performance Exhaust Installation - The Twister Going With The Flow

 Back in the day, H-pipes were the rage. The only problem is that fast-moving exhaust isn't good at making 90-degree turns. The X-pipe, however, is far more efficient at doing this. In both cases there's a scavenging effect, but the X-pipe also has great pressure balance.  View Related Article

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