After a couple days of hard work from 8am until 10 or so, the C63 AMG Fluid MotorUnion midsection is finally complete!
Thereís not too much more we can say about Fluid MotorUnionís latest fabrication project that we havenít already said. Made from stainless steel, the midsection connects to the stock header flanges up front, deletes the catalytic converters* and replaces them with a hand-made and custom-engineered x-pipe, finally connecting to the stock resonator box in the back. Here are the pictures of the completed Fluid MotorUnion midsection before we bolted it in for the last time:
During the build, we wanted to make sure that fitment was as close to stock as possible. We think we came pretty damn close, as you can see from the pictures below. Everything is perfectly tight and it runs like a charm. In the third picture down, you can see just how close to stock fitment we got, as the pipes donít even go any lower than the OEM underbody cladding. Like a glove.
And now for the fun part - the dyno video! We took this video on the day we received the C63 and again the day we gave it back to George (today, Friday). Obviously, the clips of the dyno runs are spliced together to cut down on the nothing that occurs in-between the runs. The ambient indoor temperature was roughly the same between Wednesday evening and early Friday morning, give or take a few degrees. With just about every outside condition the same between both runs, we were better able to gauge just how much horsepower this car put out. And boy, did it exceed our expectations! The C63 originally dynoed at 295.2 wheel horsepower; yes, this number is a bit low, but all Dyno Dynamics dynos have lower output numbers since their latest software update - some people call it ďThe Heartbreaker.Ē No matter, though, as weíre really only looking for the change between horsepower ratings (the delta-power, if youíre down with the specific lingo). And that didnít disappoint, either. Our Fluid MotorUnion C63 AMG Midsection ended up increasing output by 32.4 wheel horsepower. For just a midsection, this is not unsubstantial. And to make it even better, it increased the torque by roughly the same amount. Across the entire powerband! Take a look at the dyno graph below and see for yourself:
So now, enjoy the video!
The sound is even more impressive in person, trust us. It gained a very throaty growl over the stock midsection. It sounds like a beast thatís been given some slack in its chains. Thanks again to George for being so patient during our build process, weíre glad youíre overjoyed with it!
*Off-road use, blah blah blah, emissions, yadda yadda yadda.
 It would also appear that I am at the top of the StanceWorks blog page for now. That's neat. Go read it if you've got some time, help me remember that my English degree wasn't all for naught.