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help please 05 m7

today I put a mbrp can on my m7 and at WOT taking off it sputters real bad but if I take off at 75% throttle it does not miss at all. Ive got new plugs in and it did not seem to miss with the stock can on.... It is pulling about 7800 RMPs Thanks for the help...
 
many cans have been tested on the m7, stock always works and many others loose power.
 
wonder if its a octane issue then I would not think so but been wrong before or is the pipe not retaining enough heat to make is run properly uh I dont want to put that quite thing back on
 
AC efi is very sensitive to any exhaust changes ie more or less back pressure.
The THING CAN seems to be working best around here.
 
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