Got both installed, personally I can't feel that much of a performance difference, I am not really into cars and racing as much as most of you, more of any everyday driver. I had the intake installed first and the only difference i noticed was in the 6000+ rpm range with sound and a little power. After exhaust I love the tone and sound of the greddy, i wanted to keep it deep and personally I thought the hks and most sounded too high pitched although they probably sound better in person instead of video. Some people said they don't like the look of the greddy but I think it goes perfect with the athens blue. I do wish the exhaust was a little louder with the same deep sound, I can barely hear it with windows rolled up if I am cruising or accelerating slow. The video is taken in a garage with the silencers removed and it sounds much deeper in person, the camera isnt anything special just a digital picture camera that happened to have video with sound, il try to take another video in the street sometime. I am thinking about adding HFC or electric cutouts to increase the sound.

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Are you serious? I had the same setup and it was too loud for me specially on long drives, I felt like I was going deaf which is the reason I got rid of my exhaust. You have auto or manual?

 

You will have to get a tune to realize the best gains from those mods. But wait till you do HFCs.

 

i cant even hear the exhaust if i put cruise control on at 70-80 and turn volume past 5 or 6 notches, i have auto. i talked to the guy about electric cut outs today and got some info im gona try to do more research on them. i dont want to do headers and hfc because i dont really care that much about gaining more performance, its already fast enough, and getting it tuned wouldnt make as much as a difference then there was from stock to the 2 mods would it? the place i got the work done at said it shouldnt need a tune and the closest place would be dallas unless theres one in houston i havent found

 

and people were getting better gains with the stock settings on the cobb so i dont see why anyone would buy it?

 

YouTube - G35 Electric Cutout Exhaust
after reading what everyone wrote about the cutouts i think i might pass on them.