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05 m7 exhaust problem. need help!

I just bought a brand new mbrp can for an 05 m7. i had a speedwerx pipe on at first with the stock can and it ran fine. when i put my new mbrp can on, i took my speedwerx pipe off and replaced it with the stock pipe. when i got everything back together i had my stock pipe with my mbrp can. i started my sled then when i went to accelerate it took a lot of rpms to get it to go. then when i tried going fast it just kept bogging out and it was running like crap. i changed my plugs thinking i fouled them but that wasnt it. CAN ANYONE HELP PLEASE??? i dont know what to do?
 
I have a stock pipe with mbrp can on my 06 m7 and it runs fine.

What i would do is put your stock can back on and see if it fixes it. If it does then you know it dont like that can.If it still bogging when you put the stock can back on it then you will have to look for other problems.Lots of people are saying the m7 dont like aftermarket cans.

Good luck Cheers:beer;:beer;:beer;
 
The key is to do one thing at a time. If you do like your doing and have problems you dont know which is causing the problem. Cans on the m7 are hit and miss.

X2 what sledguy said....
 
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Put it on a stand and try and spin the track by hand, if it takes alot more rpms to get it goin and it will not go fast, it sounds like a drivetrain problem
 
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