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Upgrades (non TDI Engine related) The place of handling, lighting and other upgrades that do not relate to the performance or economy of the TDI engine. In other words upgrades to your TDI that don't fit into TDI Fuel Economy & TDI Engine Enhancements.Please note the Performance Disclaimer

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Old March 22nd, 2017, 02:45   #16
IndigoBlueWagon
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I posted this above but it bears repeating. The bigger restriction in the stock downpipe is the flex, not the CAT. The inside of the flex is about the diameter of a quarter. In addition, the bend coming off the turbo is far from optimal.

Having repeated that, I'll also repeat that you'll not see a significant benefit from an improved exhaust until your mod levels are beyond a tune and injectors. When my car was in the 180 HP range changing to a 2.5" exhaust got me 8 HP. On a more mildly tuned car the increase would be far less.
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