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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, 03:45   #16
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Join Date: Aug 2004
Location: South of Boston
Fuel Economy: 50/45/37

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.
2002 Jetta wagon, 358K, RC3+; 1993 Mercedes-Benz 300D 2.5, 197K; 1997 Passat, 285K; '99.5 Golf, 255K; 2011 335d, 55K; 2015 Golf Sportwagen, 5K. Principal, http://www.idparts.com
Kid's cars: 2002 Golf TDI, 2002 Jetta TDI
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