FX Engines Short-Medium manifold
FX Engines have added a new Short-Medium manifold to their line-up. A combination of short and medium manifold which makes it more universal and compatible with the majority of tracks, it was developed & designed to work well with mufflers 2131 and 2068. Suitable for larger tracks, where more bottom end punch is required than the short manifold.
Source: FX [fx-engines.com]