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Pre-Turbo Intake |
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| To improve the airflow into
the turbo I replaced the jagged stock inlet pipe with a mandrel bent 2.5
inch pipe. It is attached with a 3 to 2.5 inch silicone reducer and a 2.5
inch 90 degree silicone elbow. Actual horsepower and spool up improvement
is probably minimal, but it finishes off the intake, the turbo whine is
much louder and it looks good. The only part of this upgrade that required
any work was drilling a hole in the pipe to attach the boost solenoid
vacuum. I am using a blow off valve and a filter on my crank case so
neither of those needed to be attached to the intake. I bought the pipe at
the local speed shop and the silicone hoses off of Ebay. Cost: 9$ Pipe, $8 Connector, $15 Elbow Time: 30 minutes Difficulty: Easy | 
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| Below my TD04 turbo is pictured with the old inlet hose. The turbo inlet has been ported out and the hose fits over the entire compressor housing. The new blue silicone hose fits on the same way. |
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| Most people still have the stock turbo so this upgrade is quite different for the T25. To the right is a picture of the T25 with its inlet pipe. The inlet on the compressor housing of the T25 is much more shallow than the TD04 making it very difficult to port out or install a larger pipe to the inlet. The best/easiest solution is to cut the inlet pipe just above the 90 degree bend and attach a larger pipe from there to the air filter. This allows the crank case breather to remain untouched so the only other modification required is to use a blow off valve instead of a bypass valve. | 
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