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      06-28-2012, 11:24 AM   #160

Drives: '11 335is Coupé
Join Date: Oct 2008
Location: Previously on the Bundesautobahn

iTrader: (2)

Originally Posted by cn555ic
Originally Posted by AU335i View Post
hmm just wondering the 1792 is a 3.5 inlet/outlet so obviously that won't fit the stock exhaust...

the 1790 is a 2.25 inlet/outlet but it looks nothing like the picture you posted in your OP... do you think it will work the same? it looks like a slimmer version.
Yes 1790 is for stock piping which requires a 2.25 piping. Remember your midpipes are smaller so the amount of cubic air flow coming through into the piping will be proportional to the size of the resonators. It will work identically to the 1792. I wouldnt worry about that.
Cn555ic - thanks for making this thread, very informative and I appreciate your time to maintain it alive...

I'm getting ready to pull the trigger on a pair of 1790...trying to kill the rasp my c-PE catless DPs + the "is" exhaust produce.

Question: is there way to keep the 2nd cats and install the 1790s? Normally, taking out the 2nd cats makes the exhaust louder and even less controlled...bottom line, would you want to keep your 2nd cats?