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 Post subject: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Mon Apr 20, 2015 6:05 pm 
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Location: Saratoga N.Y.
-Whats Best/Correct Dia. Pipe For 7MGE Exhaust?
-Engine is Non Turbo with OBX header and pulley.

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 Post subject: Re: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Mon Apr 20, 2015 8:48 pm 
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Joined: Sat Feb 05, 2011 5:53 pm
Posts: 477
Location: Bay Area, California
2.5 inches

3 inches will be loud, and won't gain you a great deal over a nicely done 2.5

The muffler is going to be the real difference maker. I had a Magnaflow in before, and the car sounded rasp-y

Now I've got a straight though Borla and the car isn't any louder but sounds much deeper and better tone

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 Post subject: Re: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Tue Apr 21, 2015 1:14 pm 
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Location: Pac NW
what is the OBX collector size??

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 Post subject: Re: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Wed Apr 22, 2015 6:23 pm 
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Joined: Fri Feb 15, 2008 11:16 pm
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Location: Saratoga N.Y.
-OK the link is below.Collector is 2 inch.

-I thought it was 2.5 inch for non-turbo and 3 inch for 7mgte turbo?

-I also have an electric exhaust cutoff Y pipe I want to install.

http://www.ebay.com/itm/OBX-Exhaust-Hea ... 5c&vxp=mtr

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 Post subject: Re: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Thu Apr 23, 2015 9:31 am 
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Location: Bay Area, California
You're probably not going for absolute max performace, but that 2 inch collector pipe is a restriction.

I remember seeing a dyno on a N/A Nissan KA24DE engine, 2.25 inch exhaust vs 3 inch, and the 3 inch made more power with very little loss of mid-range torque. Conventional wisdom at the time ( early 2000's ) was that N/A engines need smaller tubes to keep exhaust velocity high. However, most dyno data at the time was coming from the much smaller engines of the Honda scene. On bigger Nissan engine, the dyno proved that the reduction in back pressure 3 inch vs 2.25 was the greater benefit to performance.

The big 3.0l 7M will prefer a bigger pipe as well.

If the extra few horsepower isn't worth the extra time in the exhaust shop to you, you'll be fine with the OBX the way it is.

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 Post subject: Re: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Thu Apr 23, 2015 11:05 am 
JNC Enthusiast

Joined: Fri Feb 15, 2008 11:16 pm
Posts: 889
Location: Saratoga N.Y.
-Thanks for the info.I don't get excited about exhaust just want it done once, close to best for my setup. 8)

-The OBX header was tough to fit so its going to stay.I can't build a custom header either. :td:

-And I thought the OBX would be better than the Pacesetter or a stock manifold. :|

-So Im leaning towards 2.5 inch and maybe Midas can change or enlarge the collector size. :idea:

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 Post subject: Re: ***Best Dia. Pipe For 7MGE Exhaust?***
PostPosted: Thu Apr 23, 2015 6:48 pm 
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Joined: Sat Feb 05, 2011 5:53 pm
Posts: 477
Location: Bay Area, California
whit wrote:
-Thanks for the info.I don't get excited about exhaust just want it done once, close to best for my setup. 8)

-The OBX header was tough to fit so its going to stay.I can't build a custom header either. :td:

-And I thought the OBX would be better than the Pacesetter or a stock manifold. :|

-So Im leaning towards 2.5 inch and maybe Midas can change or enlarge the collector size. :idea:


You're going to be totally happy I'm sure, don't worry about the OBX. Overall it looks like a nice header, it's just the collector.

I tried to fit a Pacesetter to my 7M and it didn't fit either

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