You may have heard of the X-Pipe, but what is it and how does it work?

A study of the BMW Motorsport solution to the exhaust center section.

When rebuilding an S14 engine it is common to go with a larger bore. How big can one safely go? Sonic testing gives a useful guide.

How big can S14 ports get and still make power? These pictures of a TMS Stage III porting job are a good example.

The original 2.3L intake gasket has been superseded by the Evo III part. How do the two gaskets compare?

If you're running coil-overs with linear race springs then you might consider adding tender or helper springs. This page explains how these springs work.