Has anyone installed a y pipe and muffler(perforated core/straight through magnaflow), but left the rest of the exhaust stock? My exhaust is leaking and need to replace it all. I don't want my exhaust too loud. Most people have said if you install a full 2.5" catback with a y pipe the result is very loud exhaust. Thanks

 

the reason why it gets louder is also the type of muffler you use.

 

Good to know, would the magnaflow straight through type muffler be loud? I just don't want my car to sound riced.

 

from what i have heard magnaflow is suppose to be pretty good. im useing a tenzo 4 muffler with a 2.5" y pipe and b pipe and it sounds great to me.not to loud and not ricey at all

 

I have a y-pipe, budget b-pipe w/ resonator and a flowmaster muffler. It sounds powerfull when accelerating and doesn't drone at all. Get the resonator. My car sounded awful before i got it.

 

I thought that all b pipes on exhaust systems came with resonators? Every pic I have seen has one built in to the b pipe. I will make sure it has one.

 

nope look at the stilen b pipe no resonator..

http://stillen.com/Sportscars_detail...id=4021&page=1

 

My first mod was y-pipe and the noise of my car hardly changed at all. Only at WOT at high RPMs I would hear a sucking noise which was actually quite nice... but then that got masked with the louder sucking noise from my JWT popcharger when I put that in.

80% of your sound difference will be from your choice of muffler. B-pipe accounts for 15% of the sound change. This is assuming that you keep the stock cat of course, which is what most people do.

 

80% + 15% = 95%...

 

haha I knew that some wannabe smart@$$ would comment on that...

If you read my post carefully, I implied that the y-pipe is minimaly responsible for sound... that's where I put my subjective 5%!

 

I got the Budget Y pipe and my B pipe is still stock. I bought a Vibrant muffler and it sounded alot more louder than stock. I had to put the stock muffler back on.

 

well i figured that it was the y and the cat/testpipe... but you never know with some people and math these days...

i always thought that the y would make your exhaust louder... and the b & muffler would alter the tone of it... ? am i wrong?

 

Thanks for your thoughts on this guys. I will make sure that I keep a resonator in the b pipe since I don't want it too loud.

 

I think that the y-pipe definitely makes it louder. The muffler is what produces the sound and the b-pipe modifies it. My exhaust went from just y-pipe to y-pipe+B-pipe w/o res.+muffler to y-pipe+B-pipe w/res.+muffler. They all sounded different. I like my current config. y-pipe+B-pipe w/res.+muffler. not too loud yet powerfull sounding.

 

i just installed a warpspeed Y pipe and magnaflow #14829 (i think thats it) with everything else on the exhaust stock and i love it.

i was a little weery at first given i read some bad things about magnaflow on here but im definitely happy with the way things turned out. exhaust note is nice, paired with my hacked air box my max definitely has a powerful note to it.

good luck with your decision!

 

One of the quieter mufflers is the Dynomax Superturbo. It will certainly be louder than stock if you pair it with full 2.5" exhaust system, but way quieter than any straight through muffler.

By the way, there is no such thing as a quiet straight through. Some do a better job of dampening the sound than others, but only the reverse flow mufflers are genuinely quiet (and hence the reason they are on almost every stock vehicle you will find).

If you really want quiet, use a stock 4th gen muffler. You will only lose 1-2 HP from it versus a straight through design. If you have the cash, get a 2000+ maxima muffler and have a muffler shop weld it to your car. You will get your full performance and still have your quiet ride.

(PS - I know lots you you guys love the way your cars sound - really like the growl - and I'm very cool with that - but clearly this guy wants his car to be as close to stock noise levels as possible - so don't point him to any "nice sounding" straight throughs. Everyone has their own car needs, and his are clearly not in that direction...)

 

I checked around my town and surprisingly no one does mandrel bending at all...just pressure bending.

I was underneath the car yesterday and looked at the stock piping. I could see that the bends are pressure bent. Is that what you guys have when you went with custom piping?

If I want to go with the Dynomax I'd have to settle for that kind of bending.

One last thing: the stock muffler inlet is 2.25" D. if I go with the 2.5" piping can the muffler shop change it to 2.5" D?

 

I'd look for a shop that's willing to install aftermarket exhaust products (that you purchased yourself and not through them). Then just buy the mandrel bent b-pipe from Warpspeed or another reputable vendor. You may have to drive a little bit to find a real speed-shop, but guaranteed there's at least one within an hour of where you live.

That doens't really make sense. You can buy the muffler alone. You don't have to buy an entire Dynomax cat-back! Just get a 2.5" b-pipe from Warpspeed or wherever. Then buy a 2.5" muffler to go with it (the dynomax super turbo's are available in LOTS and LOTS of sizes, so this shouldn't be a problem. There are other quiet mufflers too, but they tend to be more restrictive (like the Walker Quietflow series of mufflers.) The dynomax muffler has a pretty good flow rate, so wouldn't cost you the 0-2 HP that the stock muffler does. Of course, the stock muffler is the quietest, so if you want your car to be close to stock noise levels, that small HP loss is a small price to pay for silence.


Most autoparts stores sell connectors that do just this. Pep Boys or Autozone will have a 2.25" to 2.5" exhaust connector. Will probably cost less than $5. Any muffler place will have these connectors, too. So yeah, you will have no trouble adapting your 2.5" exhaust to the 2.25" muffler opening.

Surprisingly, using the stock 2.25" muffler doesn't seem to hurt performance much compared to a 2.5" straight through. Dyno testing has shown 0 - 2 HP difference. That's all! It's really the y-pipe that restricts most of the exhaust flow on a 4th gen maxima. That's the big bottle neck to efficient exhaust flow.

Good luck!

 

What I meant to say was that if I don't buy a B-pipe from Warpspeed or Budget, etc. then the last option would to have the pipe pressure bent by a local muffler shop.


In a supercharger application shouldn't having a larger diameter pipe be more beneficial than remaining at the stock 2.25"? Going from a wider diameter Y-pipe to a 2.25" would surely generate more back pressure?

 

Mine is not too loud with a 5th gen muffler and 2.5" exhaust and Warpspeed y-pipe.
It is slightly louder than stock. I love it.

 

You are absolutely right, that a wider exhaust will yield much more benefit to a supercharged or turbocharged car. Three inches is said to give better performance to accomodate the higher airflow. I personally run a naturally aspirated car, so I cannot speak from experience on that, so I claim no expert knowledge.

Most of the aftermarket exhaust systems for the Maxima (naturally aspirated) are 2.5" which seems to be about right for maximizing air flow rate while minimizing back pressure. It's always a compromise, of course.

I agree that it certainly seems counter-intuitive to use a 2.25" muffler when the rest of the exhaust is 2.5", but real-world numbers seem to show very little loss of power from this. I personally went with a wider, 2.5" muffler, but I was willing to be a little louder than you might like. You will not lose much power by keeping the stock muffler.

Like the guy above says though, the 5th gen muffler would be ideal. It will cost you more though. The dynomax superturbos are really cheap ($50-60 typically, though I haven't looked in a while). Your choice.

Good luck!