no mufflers? hmmm...youve gotta have at least a LITTLE backpressure to keep the car runnin...my 56 mercedes, after i re-installed another motor from a running parts car, there was no exhaust system (still isnt a total one yet, but a rusty exhaust manifold with a glasspack clamped right behind it)...JUST to keep it from stalling, i had to put tension on the throttle linkage to the carbs, had it idling at 1500k...every now and then, there'd be a little flame comin from the exhaust ports (where the headers SHOULD have been) it runs like crap so far, even though the motor had a fairly recent restoration, just swapped out the orig. carbs for dual 2-barrel weber carbs before i headed off to school...we'll see how it runs come springtime!! anyway, bout that setup, that suckers gotta be annoyingly loud. that benz, even though its a 4cyl, sounded like a shrieking frieght-train when it was fed some revs...lotsa lifter click-clacking...