Custom exhaust on my G35x sedan
06-08-2010, 05:37 PM
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Custom exhaust on my G35x sedan
When I first bought my 08 G35xS sedan, I installed Berk HFCs. Of course I got the nasty rattling rasp that HFCs produce on all HR motors. My next step was to try a set of Magnaflow 12225 mufflers welded in place of the OEM mufflers. I got a little more sound but the rasp was no different. I decided that I wanted a very mellow full catback exhaust. I also did not want to spend $1000+. What few AWD exhaust options out there were neither quiet nor cheap. So a buddy and I built our own.
The parts:
2 x Magnaflow 12225 mufflers
2 x Magnaflow 10415 resonators
1 x Magnaflow 11385 X-pipe muffler
2 x Vibrant 1471S 2-bolt flanges
16 ft 2.25" aluminized tubing
6 exhaust hangers
high temp black BBQ paint
After a lot of work and test fitting, the end result is awesome. The sound is clearly aftermarket but very mellow. A lot quieter than the Fast Intentions exhaust on my wife's 04 G35 coupe. The system eliminated 100% of the HFC rasp as well. I can't say for sure if there are significant power gains but my main goal was sound. There is mild drone around 2500 rpm (65 mph). I wish there was no drone but it is tough to increase the sound level on the VQ motors without some drone. I have attached a cell phone pice of the complete system. It isn't pretty but it doesn't need to be since it is under the car. I also learned MIG welding along the way. My only criticisms: we had no access to a mandrel bender so my tubes are crush bent but they still flow more than OE. Also, 304 stainless pipes are 5x the price of aluminized steel. I paid $60 shipped for the 16 ft of aluminized tubing. Stainless would have been over $300. My cheapo solution for rust was black BBQ paint. I am quite happy with the end result.
The parts:
2 x Magnaflow 12225 mufflers
2 x Magnaflow 10415 resonators
1 x Magnaflow 11385 X-pipe muffler
2 x Vibrant 1471S 2-bolt flanges
16 ft 2.25" aluminized tubing
6 exhaust hangers
high temp black BBQ paint
After a lot of work and test fitting, the end result is awesome. The sound is clearly aftermarket but very mellow. A lot quieter than the Fast Intentions exhaust on my wife's 04 G35 coupe. The system eliminated 100% of the HFC rasp as well. I can't say for sure if there are significant power gains but my main goal was sound. There is mild drone around 2500 rpm (65 mph). I wish there was no drone but it is tough to increase the sound level on the VQ motors without some drone. I have attached a cell phone pice of the complete system. It isn't pretty but it doesn't need to be since it is under the car. I also learned MIG welding along the way. My only criticisms: we had no access to a mandrel bender so my tubes are crush bent but they still flow more than OE. Also, 304 stainless pipes are 5x the price of aluminized steel. I paid $60 shipped for the 16 ft of aluminized tubing. Stainless would have been over $300. My cheapo solution for rust was black BBQ paint. I am quite happy with the end result.
Last edited by bsowhat1; 06-27-2010 at 08:00 AM.
06-14-2010, 05:27 PM
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When I first bought my 08 G35xS sedan, I installed Berk HFCs. Of course I got the nasty rattling rasp that HFCs produce on all HR motors. My next step was to try a set of Magnaflow 12225 mufflers welded in place of the OEM mufflers. I got a little more sound but the rasp was no different. I decided that I wanted a very mellow full catback exhaust. I also did not want to spend $1000+. What few AWD exhaust options out there were neither quiet nor cheap. So a buddy and I built our own.
The parts:
2 x Magnaflow 12225 mufflers
2 x Magnaflow 10415 resonators
1 x Magnaflow 11385 X-pipe muffler
2 x Vibrant 1471S 2-bolt flanges
16 ft 2.25" aluminized tubing
6 exhaust hangers
high temp black BBQ paint
After a lot of work and test fitting, the end result is awesome. The sound is clearly aftermarket but very mellow. A lot quieter than the Fast Intentions exhaust on my wife's 04 G35 coupe. The system eliminated 95% of the HFC rasp as well. I can't say for sure if there are significant power gains but my main goal was sound. I have attached a cell phone pice of the complete system. It isn't pretty but it doesn't need to be since it is under the car. I also learned MIG welding along the way. My only criticisms: we had no access to a mandrel bender so my tubes are crush bent but they still flow more than OE. Also, 304 stainless pipes are 5x the price of aluminized steel. I paid $60 shipped for the 16 ft of aluminized tubing. Stainless would have been over $300. My cheapo solution for rust was black BBQ paint. I am quite happy with the end result.
The parts:
2 x Magnaflow 12225 mufflers
2 x Magnaflow 10415 resonators
1 x Magnaflow 11385 X-pipe muffler
2 x Vibrant 1471S 2-bolt flanges
16 ft 2.25" aluminized tubing
6 exhaust hangers
high temp black BBQ paint
After a lot of work and test fitting, the end result is awesome. The sound is clearly aftermarket but very mellow. A lot quieter than the Fast Intentions exhaust on my wife's 04 G35 coupe. The system eliminated 95% of the HFC rasp as well. I can't say for sure if there are significant power gains but my main goal was sound. I have attached a cell phone pice of the complete system. It isn't pretty but it doesn't need to be since it is under the car. I also learned MIG welding along the way. My only criticisms: we had no access to a mandrel bender so my tubes are crush bent but they still flow more than OE. Also, 304 stainless pipes are 5x the price of aluminized steel. I paid $60 shipped for the 16 ft of aluminized tubing. Stainless would have been over $300. My cheapo solution for rust was black BBQ paint. I am quite happy with the end result.
06-14-2010, 05:57 PM
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This is a cool option I hate that there are so few options and even more so for sedan and X coming from an evo where we had 100's of options for everything... and like you said the few options are priced nice! haha
06-15-2010, 10:07 AM
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I think it's all relative, right? It's quieter than other cars I had in the past, but probably louder than lots of other options for the G37. I like it the way it is now, but might add some resonators to reduce some of the rasp in hard pulls in 1st and 2nd gear.
06-27-2010, 01:08 PM
#6
The only issue with the X sedan vs. RWD sedan catbacks is the transfer case by the transmission. The passenger side pipe needs to be bent slightly different.
This is the RWD system:
http://www.fastintentions.com/images...7-image139.jpg
This is the AWD system:
http://www.fastintentions.com/images...7-image143.jpg
That literally is the only difference. It's a shame more companies haven't made something for the X. Competition is always good!
06-27-2010, 01:30 PM
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The sad thing is that if you build an exhaust for the G35/37x, it will fit the RWD cars too. The reverse is not true. No need for 2 exhaust systems. Nissan and Stillen both do this. FI bends 2 different passenger side front pipes to accommodate RWD and AWD cars (not sure why they do this - just sell all the setups with the AWD pipe). Unfortunately none of the other companies consider this (ARK, Magnaflow, Borla, Invidia, etc). I considered FI but it was more than I wanted to spend and too loud (I have a FI system on my wife's G35 coupe).
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06-27-2010, 07:26 PM
#8
The sad thing is that if you build an exhaust for the G35/37x, it will fit the RWD cars too. The reverse is not true. No need for 2 exhaust systems. Nissan and Stillen both do this. FI bends 2 different passenger side front pipes to accommodate RWD and AWD cars (not sure why they do this - just sell all the setups with the AWD pipe). Unfortunately none of the other companies consider this (ARK, Magnaflow, Borla, Invidia, etc). I considered FI but it was more than I wanted to spend and too loud (I have a FI system on my wife's G35 coupe).
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