Thread: Just intalled 4" turboback..wonder if i should have went 3.5" DP?
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Old Sat, February 20th, 2010, 11:23 AM
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Loss of torque?
HA!

There will be a slight reduction in flow velocity in the immediate junction between the turbine housing and the downpipe but in a 7000# lb. truck you'll never notice a couple HP at low RPM.

If backpressure is good, then I should be able to pop wheelies once I get around to doing the "potato stuffed in tailpipe" mod.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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