These are available now in a very limited quantity at current pricing until we need to re-order the machined adapters, so get one now before the price goes up!

This is included in 2023 and later versions of the conversion.

NOTE: May be incompatible with existing AC line routing for those with AC already installed. May require different compressor block/line rerouting. 

This kit includes the four point exhaust hanger kit, and the downpipe as well. The exhaust catalytic converter/manifold is purchased off-the-shelf, see guide on purchase with this link.  They cost $100-$330.

With 2023 comes a minor revision to the SK-E/exhaust of the Bostig conversion.

The revision provides new benefits in addition to the benefits of the original Mitsubishi catifold upgrade:

• Significantly greater clearance to the decklid/lower decklid temps
• Allows use of a longer flex coupler to extend its life
• Allows purchase of catalytic converter off-the-shelf
• Places muffler further from AC compressor for those with AC
• Backward compatible with current muffler, but also allows for different mufflers by changing the downpipe alone. 
• Allows full coverage heat shielding
• Easier O2 sensor access

The revision is a major simplification of the heatshielding, which in addition to the now available catifolds on eBay for just over $100,

the total savings is over $400 vs the pre-2023 RG9+ Exhaust

The new exhaust is similar in idea to the core idea of the conversion itself: Design simple and rugged non-wearable custom parts to allow use of off-the-shelf complex wearable parts.

The new exhaust is the most technologically advanced design process workflow that has been achieved at Bostig to date. Advances in 3D scanning, 3D printing, and CAD made the design and execution possible!