Can i put magnaflow mufflers on a JBA shorty header / h pipe setup on my 1968 mustang coupe? (289)? - Mustang Evolution

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Old 12-15-2011, 08:15 AM   #1
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Can i put magnaflow mufflers on a JBA shorty header / h pipe setup on my 1968 mustang coupe? (289)?

Yes you can.
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Old 12-15-2011, 09:14 AM   #2
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Can i put magnaflow mufflers on a JBA shorty header / h pipe setup on my 1968 mustang coupe? (289)?

Yes. Keep the pipes small. That engine stock will make more power and torque with 2 inch pipes than with anything bigger. You don't have the Cubes/CFM movement through the pipe and engine to make the pipe scavenge the intake. If you want to gain about 35HP and 40 lbs of torque, put a single 2 -1/4 exhaust on there with a dual outlet muffler(for the dual look.) You'll have enough exhaust system to handle up to about 275 HP. Singles will ALWAYS make more torque and HP on a naturally aspirated engine, up to 7,000 RPM. Done right, you'll see bigger power and more gas mileage, too. It's a win-win.

Everyone thinks it's about breathing. It's actually about scavenge. If you build enough scavenge in the pipe, you'll scavenge the intake harder during the overlap phase.

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