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I Recently Had An H-Pipe Installed Without The Cats, And The Problem I Am Having Is That The Fumes Are Somehow Coming Into The Through The Heater, Or When The Heat Is On And The Car Is Running. It Did Not Do This When The H-Pipe Had Cats. If Anyone Has Any Knowledge About This, Please Give Me A Buzz. Thanks In Advance.

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MIBLKSTANG01

P.S. Sorry Guys About The First Thread!!
 

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Only thing I know to tell you is take it back and make them look for exhaust leaks.

If its really cold outside which i imagine it is in detriot then crank your car up and look under your car near your headers and see if you see exhaust gas coming out and pop your hood and look as well.

I have your same set up without any problems
 
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