|
1.75" primary pipes are very large for a 1911cc engine unless it is a high rpm screamer that makes 200hp. 1.5" primarys will support up to 150hp and give much better driveability. Primary dia. and length are the most critical elements of a header design, closely followed by collector dia. and length. Every VW header I have seen has too short of collector for optimum power.
Primary dia. is based on hp level of the engine, primary length dictates the rpm the header is tuned for. This is from 2 custom header builders that have been in business for 40+ years each and thousands of dyno tests.
ken
|
July 24th 2003, 11:39
Threaded Mode