Hey guys,

(edit: I added a zip file with 3 recordings below.

#1: Sitting in cabin - holding recording device (Samsung i730) in cabin at window level (window open)
#2: Phone placed at rear wheel out about 12 inches
#3: Phone placed 2 feet behind rear exhaust

Now -- these files aren't exactly spitting images of what it sounds like, it sounds louder and the note is a bit different than in real life.

The most acurate recording is somewhere between #1 and #2.)

Yesterday I had my pre-muffler removed (that big ugly, heavy box) and in it's place I put a generic 18" long glass-pack.

While the sound difference is minimal, it is noticable. It is slightly deeper, definately has it's own unique sound, but I want the volume to be slightly louder.

I'm considering trying out one of those Magnaflow Mufflers instead of the glass-pack, though, this current glasspack gives me a put of a change in power.

From 4000+ RPM my car pulls quite a bit harder. Now, with the glass pack, it has a little more resistance within the piping than it did with the stock pre-muffler, though the actual pipe is 2.5". On the pre-muffler, the piping entrance and exit is actuall 2.5" as well, but inside of the piping it gets slightly thiner, 1/4" to be exact.

I'm not sure exactly why I'd notice a difference, since everyone else isn't, but I can't complain :-)

Now lets help me decide, do I go with a straight pipe and try that on for sound, or do I spend another $80 (instead of $30 for the straight pipe installed) for the magnaflow. I can't decide...but my car BARELY got louder with the glass-pack. If I didn't own the car, I would think it's stock.

 

You should try different LENGTH mufflers for changes in volume. For instance a 8" one instead of an 18" one will make the exhaust note quite a bit louder. I don't think you'd want to go with a straight pipe, that would be too loud, but I bet with a shorter glasspack you'd be happy.

...And if it's sound you're looking for, I bet changing the end muffler for a nice magnaflow unit with some nice tips to boot would make a satisfying difference too.

 

Well -- I like the sound right now...it's sexy.

You can still tell that it's that unique G35 sound, but it separates my car from both the Sedans and the Copues/350Z's.

It's a bit deeper, still quiet when I'm driving like my mother, but when I get on it, it sounds better.

I want it to be sensative like the coupes, fx & 350z's. They get good volume, and maintain a good sound.

Changing the muffler would change the sound, I really dont want to lose the sound it has, I just want to gain some volume :-)

 

No comments or suggestions?

 

I like the sound. Posted my response before you added the zip file and stuff. Sounds very nice.

 

Thanks for the post and sound bites. Do you have any other mods on the car? Z tube or CAI? BTW the car sounds good.

 

Thank you much :-)

No other mod's as of now. I was considering a CAI, but I dont want it to be entirely noisy, and I'm not sure if the performance is worth the money, will I really notice a difference? If so, what do you think it'd do for a quarter mile? .1, not even?

I'm growing to like the sound more and more - I think I might stick with it.

 

Where did you get the glasspack? How much?

 

Local shop here in the Bay Area, CA. Exhaust Specialists, located in Burlingame on California Drive.

Installed $60

 

Any guys with the mid-pipe care to comment on the sound? I'm curious to know if it sounds similiar? Should I go out and buy the pipe anyway?

Got any sound files to compare?

 

It sounds too rough. Getting a coupe midpipe or the type of mod you did is counter productive for the '05 models.

There is little or no change in sound and performance between the coupe midpipe and the '05 OEM pipe. In fact the coupe midpipes will produce some droning. The '05 pipes are better designed than its predecessors and perform its best.

I would invest in a set of cats, y-pipe, rear muffler or a full cat back system for sound and performance. JMHO.

 

Chico, while I appreciate your response and feedback, while I may disagree slightly.

As far as performance goes, I can't give you a proven result until Wedenessday, but I can tell you that the car definately feels quicker above 4k RPM's. In fact, I'm driving an 05' G35X that wouldn't even consider breaking the rear tires loose previously. My car now chirps the rear tires from 1-2 and in the rain it will start pulling sideways after 4k RPM.

As for sound, the *SOUND* is very close to what it was before. It'd a tid bit deeper and has a comfortable growl to it. The volume, however is a bit louder.

The volume of sound coming from the pipes in a Coupe is a lot louder than the volume of sound coming from a Sedan, and that's the way the car was manufactured...I prefer more exhaust sound.

It's a lot easier for me to modify my exhaust than it would be to add 2 doors, a back seat, all wheel drive and a bigger trunk to a G35c, so I chose the possible ;-)

As far as the way these cars were designed, etc -- I have much faith in Infiniti & Nissan when it comes to R&D, but they were looking for a lot more than just performance in these cars. I have no doubts that the design of the exhaust can be improved to ones liking.

Though for the sound, performance and resonation that Infiniti wanted these cars to have, I can't compete, but I can definately make it what I want as far as performance and sound goes.

I'll take my car to the track and run it and we'll see what I pull. Best time for my X previously was 14.9 -consistant numbers.

 

" My car now chirps the rear tires from 1-2 and in the rain it will start pulling sideways after 4k RPM."

Might want to see the dealer. Somethings wrong. The X should not do this. Maybe your VDC is malfuntioning.

Are you kidding me? Your AWD car now chirps between gears, and goes sideways due to a midpipe change? Gimme some of those drugs.


The midpipe change adds a VERY MARGINAL hp increase, if any. It is usually done for sound.

 

I'll tell ya what -- I dont think I'd want to go to the dealer, perhaps the service department at an infiniti dealiership, but I'm not looking to buy another right now ;-)

Also, it's not the coupe mid-pipe, it's a slightly modified stock pipe.

As for the change which occured, somehow giving me power, I didn't expect it to, in fact, I wanted it just for sound, I'm simply stating my observations since the modification.

Also, as far as the X -- as we all know, it is based on the ATTESA. It's a Primary Rear Drive, AWD vehicle.

By the time I get to the top of first gear, the power is 100% to the rear, assuming road conditions permit, I highly doubt that my car has the ability to assume it is going to chirp gears. Once it does it, it will prevent it from doing it further, but I doubt it will prevent it before it happens. It has to sense a slib, to prevent or compensate for one.

Also -- VDC is off when it pulls sideways -- but doesn't have to be for the tires to chirp.

 

"By the time I get to the top of first gear, the power is 100% to the rear, assuming road conditions permit, I highly doubt that my car has the ability to assume it is going to chirp gears. Once it does it, it will prevent it from doing it further, but I doubt it will prevent it before it happens. It has to sense a slib, to prevent or compensate for one."

I think I need a translator...