[Trendy Exige]

The question I have is whether the Exige S/240/Elise Supercharged header already come in a bigger piping than the naturally aspirated Lotus vehicles? If the short headers are all the same on NA vs. the FI Lotus and nothing has changed since 2005, then it would make sense to go with an aftermarket header that has bigger piping.

Many of us who looked underneath our cars are already aware that these Lotus cars are already equipped with headers along with its own heat shield. However, if these headers were the same as the naturally aspirated cars, the efficiency of the flow must be increased since the car is now a completely different animal. Thus, bigger pipping will help increase more flow as long as the inlet (piping of the header) and the exit (exhaust) are the same diameter in piping.

I looked into the thread about porting the stock headers and it seems that it would be trivial to see a significant amount of performance gain by taking that route. Porting the headers would only make sense, whether its the stock headers or the aftermarket headers if my goal was to squeeze out every single amount horsepower as I can get out of it.

Are the stock headers are made out of iron cast metal? If that is the case, then the weight is a concern and perhaps going with a lighter weight stainless steel can help in the weight reduction department as well.

Insights anyone? Feel free to chime in....

-Andy