G37 V36 Sedan 2009 + Discussion about the G37 Sedan

Custom exhaust suggestions

Old 03-07-2018, 10:14 AM
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Custom exhaust suggestions

Hello fellow G owners,

I drive a '13 G37x sedan and recently removed the OEM mufflers as the first step in my process of building a custom exhaust. I had the exhaustshop cut off the stock piping up until the OEM resonators and welded on a larger 2.5 steel pipe that leads out to the exhaust tips.

The problem right now is that Ive lost the low deep tone that I heard when it was just the muffler delete with no upsize in piping. The drone is so loud at 1500-3000rpm that it mutes the aggressive tones of the VQ. Not to mention the slight drone cruising at 75-80mph. My understanding is that the OEM resonators are designed for the smaller stock piping, and the upsize in piping has distorted the flow of air/pressure, causing the drone I am hearing. My goal is to eliminate as much drone as possible, while retaining a low deep tone in the exhaust.

My next step is to replace the OEM resonators with a pair of Vibrant ultra quiet resonators. However, as I read more and more about different custom exhaust set ups, I am beginning to wonder if I should perhaps replace the OEM resonators with chambered mufflers instead, or even keeping the OEM resonators all together, and just welding a pair of mufflers to the 2.5 piping. Will either of these alternatives provide me with the deep growl that I am looking for while removing the drone I am experiencing?

Would love to hear any input from exhaustenthusiasts or anybody that has gone a similar route with their G37.

Thank you!
Old 03-07-2018, 12:22 PM
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Slight drone at 70-75 with no mufflers?? Did they make the G37 engine quieter than the 35?

I have a G35 with the non revup motor with HKS replica mufflers and resonators, I couldn't stand the drone up hills or on the highway at any speed.... Installed magnaflow 11386 resonated X pipe in place of the ebay resonators, and that was the best $100 I spent on my car. Only time it ever gets annoying now is at 2500 rpms under load but it is quieter before and after that so I just stay above or below depending on whether I gotta go fast

I think that part will get you to where you want to be. If not, you can always go quieter and put on nice aftermarket mufflers as well, which is my next setup if/when these ebay ones rust off.

Last edited by cswlightning; 03-07-2018 at 12:34 PM.
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