slight update..

I 've been driving around this afternoon listen to the new Z tube. I can hear a slight noise just off idle, and maybe it is a little more aggressive sounding in the upper RPMS......certainly not much.

If I didn't change the tube myself, I would never know that anything is different. That is how slight the change is.

 

Just an observation, but it seems that the guys not noticing any improvements in sound all appear to be driving 05 6MT's.

 

Have any of you looked inside your stock tube? There is a small hole (maybe the size of a dime) in the top of the tube for the upper resonator. On the bottom of the tube, there is a larger hole (a bit bigger than a quarter) for the lower resonator.

What do yours look like? AFter work, I'll take pics and post them. Maybe the intake tube for the '05 6MTs is different.

 

You'll notice the roar more above 3k rpms, and the difference in performance is negligable. (a few ponies). Yes a coupe midi will accentuate the noise more.
C.

 

Could it also be that the ones hearing a bit more noise also have k&n drop in? Since that sucks in a little more air

 

My 05 Auto sedan has the same size holes as the one you describe in the stock tube.
I do not have the K&N and I definitely hear the difference.

 

Just got my ztube in this evening. Nada. I would say that I was very disappointed, but after reading about the lack of sound form other 05 6MT's out there, I can't say I'm too surprised. Next up, popcharger...

 

I noticed a bit more growl with the RPM's > 3000, but nothing below that. I also have the K&N drop in, I don't know if that makes any difference.

 

It must be the 6MT/5AT thing. I have the '05 5AT and i think i agree that it's twice as loud above 3K rpm than before. Before it would just get higher pitched and have more vibration at higher rpms. After ztube it now it has a distinct moan that resonates in the cabin at higher rpm. Again i relate it to the sound of a small block V8 with the air cleaner cover removed or "flipped up" on top of a 4barrel carb.

My buddy has the 05 6mt and just put on a ztube..we'll compare next time i see him.

 

Do not expect a sound difference with the coupe's midpipe on your '05 sedan. I just installed the coupe middy, and can't hear or feel a difference. However, I am happy with the weight savings.

Here is a comparision of the two pipes side by side:

 

spread the word!

 

Interesting....my coupe middy + HKS twin style muffler sound awesome...I love it, and the powerband feel is so much better, its unreal. My car feels like a new car to me.

 

Where did you get the HKS muffler? Is it bolt on? How much? Thanks

Also did you ever drive the car without the HKS muffler, did you like the mid pipe this much then?