Well I installed my new toys and I must say that there is a great improvement overall in the throttle response. I love the sound however I have a few questions.

( I have an 08 G37S coupe )

I went from an 06 g35 coupe to this and I thought the 06 coupe had a better sounding exhaust for sure.. On my 08 g37s coupe With the factory exhaust I noticed above 5Kish there is a small rattling sound, or i guess you could say (bumble beeish?) sound when you gun it..

When i changed to the stillen. The overall deepness of the exhaust is much better, but that sound is still there when you gun it!

Does anyone notice a change in sound above the 45-5K mark on the factory exhaust??? (I might be crazy)

and anyone else on her with a stillen exhaust who can hear what im hearing?

normal???
Again I might be crazy

I appreciate the help!

Thanks!

 

I know there is a tsb on the exhaust if you look for it at the top tabs. Someone asked about this before.

 

A buddy of mine had the same problem once he hit a certain rpm. Perhaps an exhaust leak somewhere.

 

I know about the factory exhaust but I'm saying same noise around the same rpms with the stillen too!?:/

 

If it is a "hiss" sort of sound, it's from the engine. Someone who just got their new Fast Intentions exhaust system and test pipes installed still heard it. It's really going to happen no matter what exhaust system you have.

 

correct
I just installed F.I Test pipes and my ark exhaust does the same

 

Yea got I got RHFC and it hisses after u let off the gas

 

I get that when you let off the gas too. My understanding is that is some sort of back pressure. But again this is more like if you floor it you get a louder sound in the upper rpms. Slight bee-ish I think. It May be normal and I may be crazy...

I will take a video on the way to work

 

You heard it on the stock exhaust then heard it on the new exhaust? When you floor it ?

 

Okay heres a video.. Maybe your right it is more of an air sound... hm
you can here it from 07-10 secs and 20-21 secs and the most at 52-53 secs
IMG_6539.MOV - YouTube

All of my friends say it sounds great/normal. Idk again with the crazy lol

Im hoping its normal.

 

I don't hear anything abnormal with your exhaust. I thought maybe it could be rasp since you're saying it only occurs at WOT but I can't hear any of that either. The hissing is also normal when you let off the throttle. I had that on my stock exhaust. It's a bit louder now with HFC and Tanabe lol

 

Thanks for the input.


Even in the last few seconds of the video?? Thats when it was most noticable..

 

Anyone else with input? normal? abnormal?

 

Didn't hear much in the last few seconds either.

Also give it a few hours for more guys to respond as most are still at work.

 

Its that louder tone that I'm hearing I just want to make sure is okay.. Iv never owned an aftermarket exhaust so I'm probably just over thinking it..

Maybe it is a little " Raspy " ? Is this normal? If someone else has this exhaust maybe they can relate.