I got a sport muffler last year from South Bay Infiniti. The MSRP was $789 and the listed price on their website was $710, but the dealership employees told me there was a sale and they knocked the price down to about $550.

At low RPMs, the muffler is only slightly louder than stock, but at higher RPMs (3.5K+), it's a lot louder and sounds amazing. Like others said, it keeps the original exhaust note, but makes it much louder. I really like how Infiniti designed the engines and exhausts on these cars, the volume of the engine/exhaust increases gradually as you gain speed and torque. It basically tempts you to take it to high RPMs any chance you get.

 

You missed the part where everyone says you need to use a coupon to get 25% off. The coupon code is SESTORE2015

My sport accessory exhaust. Much louder and deeper without any drone. Perfect OEM fitment. Great price for what you get.

Click the image to play the video:

 

I purchased the muffler from Willow Grove at Xmas time with extra discount and got mine shipped for under $530! That price is better than any other exhaust company with the exception of Megan. The sound is pure SEX! My fiance and sister are not into cars at all but they both said it sounds SO good. My fiance said whatever car shes gets next I have to make it sound that way! It's quiet cruising down the road and any throttle you hear it some but 3-4k under mild acceleration is fanatastic! Any WOT pulls sounds great up to 5k and from that point I can't hear it over the R2C intake haha!

When I installed it on my coupe I added an Autokits V1 carbon diffuser and splash gaurds. This really makes the car look like a true S model where the exhaust is bigger but hidden by the diffuser. Also IMO the diffuser matches the front 2011+ sport bumpers much better than the stock rear. As far as install time, maybe 30 min in a driveway. Its 4 bolts that come off easy and hard part getting the old muffler off the hangers. I recommend some lube on the hanger to ease the old muffler coming off. All I can say is buy it!

 

Man do I want one

 

Updated post to show picture of sport exhaust and autokits diffuser

 

how long did it take you to install? thanks!

 

In some of the posts they say it takes about 30min.

 

All the axle backs are easy to install 4 bolts and the hangers however thats my opinion and I have installed tons of Corvette exhausts.
The only complaint I have researched and agree with is the way the OEM performance exhaust stick out in the back.....but if you buy a diffuser looks great! Or if you want a quality option that does not stick out in the back try Tanabe.

Oh by the way use this on the bolts....better than PB in my opinion..