Is the stock muffler baffled like a flowmaster muffler, or is it more or less a straight through like a magnaflow, but with glass pack? The reason I am asking is that I want to retro fit one on my 98 Volvo V70 R, would like to go magnaflow, but the wife would kill me. The G35 stock exhaust note would be perfect! I would be looking at getting dual cans from a 07 if they are straight through?
Any assistance would be greatly appreciated!
Great site!
Cheers and Thanks!

It's actually a variable capacity setup. During light cruise, only one pipe is utilized. When around 50% of throttle is applied, a flap opens and the second pipe comes on line. Nissan orginally used this setup on the later model Skylines and have been used in the 00-03 Maximas and the latest Sentra SER/Spec V. The stock muffler actually flows quite well.

Dumb question but on variable capacity mufflers what activates the flap? Is it just the volume of exhaust flowing through the muffler (i.e. when you punch it the higher volume of exhaust forces the flap to open)?

Has anyone hacked into a oem sedan rear muffler. I pretty much know the in's and out's on my mid muffler, just wondering if anyone has done the same with the oem rear muffler?

Depends on the system but exhaust pressure is the way I had it shown to me. Mercedes started using this in 1990 on the SLs to get the extra power with very little exhaust note at what they call cruising speeds. That V8 sounds great but they really deaden it until the flap opens up. The G Sedan will benifit from a mid pipe off the coupe but I have yet to see any dyno works showing the numbers. It feels a little quicker to rev though and the sound is even better but there is some drone to deal with.

slightly OT but is the hks rear section also variable?

^ No idea. Even more OT, do you know if ours have been shipped out yet?

No. No aftermarket companies offer variable capcity designs. It would take them way too much R&D time and money they're not willing to spend.

hmm interesting. well i think the variable capacity design that keeps it quiet is probably what i'm looking to get rid of with the hks

The variable design is to make for a quieter exhaust, but also to improve lower/midrange throttle response by keeping the exhaust velocity at an ideal flow.

i'll have to see if anything changes or if it's noticeable anyway... i don't think anyone's posted about a noticeable difference with the hks vs. stock

sound wise its x10000000000 better

There is no noticeable change in power with the HKS but as stated above it sounds soooo much better!

Is the 2005+ Sedan midpipe the same as a coupe? I heard they did revise the 2005+ sedan's midpipe. Is this correct??

The 2005 midpipe is not the same as the coupe but yes it was redesigned (the resonator is smaller than in previous years). It is now somewhere in between the coupe middy and the '03-'04 sedan middy.