Before and After Dyno of stock HR headers, HR cats, HR y-pipe on 2005 6MT Coupe
#16
#17
I didn't take any video/sound clips of the exhaust because it sounds almost exactly like stock, except a little louder. There was no change in the tone.
#18
Another potential bottleneck is that I still have the stock exhaust, which is only a single exhaust. On the 2008 HR engine, these parts are used with a dual exhaust setup.
The main reason why I'm keeping the stock exhaust is because I like the way it sounds. I still think it sounds better than the exhaust on the current G37.
#19
#20
That's funny because for the HR engine, Infiniti touted the new exhaust components as one of the main factors for the power increase. I wonder why they went through the trouble to redesign the headers, cat length, and y-pipe. Maybe there are other things that the VQ35DE is missing that would help it take greater advantage of these component upgrades?
#22
i remember the hype over the HR y-pipe and it was a hot commodity. I don't ever recall hearing about the headers and cats. maybe the headers was redesigned, but they were never a cost effective mod, even with aftermarket headers, so i can't imagine anythign coming from the factory doing much. Cats, unless hiflow, i'd assume are like any other cats. There's only so many bends from that simply pipe to 'improve' upon. You definitely got the parts and labor at a great rate, but at the end of the day, you went from stock to stock. It's the tune that netted you most of the gains. The money would have been better spent on spacer or mrev and hiflow cats.
#24
#25
That's funny because for the HR engine, Infiniti touted the new exhaust components as one of the main factors for the power increase. I wonder why they went through the trouble to redesign the headers, cat length, and y-pipe. Maybe there are other things that the VQ35DE is missing that would help it take greater advantage of these component upgrades?
Otherwise, I stand by what I stated before - long tube headers, a good intake and exhaust and a great tune will put you at 280whp+ easy. Don't bother with the HR stuff, as they are only marginally better than the DE parts.
And the biggest gains in the HR are in the intake manifold sysyem.
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