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A proper fabrication day at last instead of endless measuring and moving tubing around on the floor.
Today’s progress focused on the center section of the exhaust system. The catalytic converter support brackets are now fully fabricated and tack-welded into place, giving the front section much better structural support before final welding.
The catback section is also finally starting to come together. The dual 3” routing from the downpipes rearward is now established to a point, together with the new H-pipe section and dual resonator layout.
A lot of time went into symmetry, packaging and keeping everything tucked as tightly as possible around the transmission tunnel, braces and heat shielding. Space underneath the C218 is deceptively tight once you start routing true dual 3” tubing properly.
The crossover itself uses a smaller interconnection between the primary pipes rather than fully merging the banks. The goal here is mainly acoustic tuning — preserving the character and separation of the dual system while slightly smoothing pressure behavior and reducing harshness in the midrange.
Last year we also built a high-power Maybach S500 together with a fully custom exhaust system, and we were very happy with the final sound character. This time, though, the goal is to experiment with a slightly different crossover strategy and see how it affects tone, texture and overall character on the M278 platform.
The resonators are positioned directly after the H-pipe section, which should make for an interesting comparison once the system is fully welded and tested.
Still a lot of welding and finishing work left, but for the first time the entire rear half of the system is beginning to look like an exhaust now.
JRSpec 200 CPSI sport catalytic converters remain part of the setup.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
but I do have the MoBridge unit and would recommend 
