My resonator just before the muffler has a big crack in it. I guess it costs like $900??? A guy says he will try to weld it up but it will take a few days since the metal is so thin. In the mean time, I plan to put in a straight pipe. Will I have any error codes/issues if I put in a straight pipe?

No vehicle that I know of has a " Backpressure Sensor " in the exhaust.
Therefore I can't envision any check-engine light coming on, as you're only reducing ( ever so slightly ) the backpressure.
A little more resonance is about all you can expect.

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2007 C 230 Sport.

I've seen this exact problem on a 99 C43 before. You may want to check and see if there is a service bulletin on that issue.

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

It wasnt a "back pressure sensor" I was worrried about. It was the MAFS reading more air and retarding timing. I have heard this happens on some cars with cold air intake. But, according to the w202 forums it is not an issue with the c43. $40 straight pipe is much better than an $800 premuffler.


The recall was on the cats and not on the premuffler

Thanks for the help.