Honestly im not sure man......I gotta go get it dynoed to really see what the power gains are! But I have to say it was tough to really decide on the exhaust since like you said there was very little information on it (as there is still very little) but it sounds beautiful! Im extremely happy with it.

 

no one has talked about the hks TI exhaust bc it costs a ridiculous 1600. If your worried about tq get the nsimo.

 

I had the Nismo (came on the car) and I have the borla now (did a swap.) Didnt notice any TQ loss in the butt dyno. My first exhaust I plan to purchase will probably be the stillen as sport Z mag showed it giving 2nd most HP (just .1 under the Borla) and the most tq (7.3 to the nismos 4.5) it is heavier but not so much so that it would make it perform worse than the nismo.

 

as I posted once

 

I agree, but I think from a practical, realistic standpoint, it is a pretty sure bet that each header weighs within 5-10% of one another. So, let's assume a set weighs 10 lbs (per pair) - if another set weighs even 15 lbs (7.5 lbs per side), which represents a 50% increase in overal weight, do you think you would notice it? I bet you could put a set of 10 lbs headers on and a set of 30 lbs headers on and you still would not notice the difference.......

so yes, while mass is mass, the weight of the header is not why you pick one over another. That is like tire shopping and looking at weight and not what is known to grip the best.

 

I'm also trying to buy exhaust system for my Z. Any one has dyno result on stillen system? or any other brand... I'm considering Nismo, Stillen, ARK, Invidia.

 

Look at the previous pages, I posted a quote from Sport Z Mag when they did dyno results of a few top exhausts.

 

A few years ago, i think it was that long ago, Strickly Z did a cat back exhaust dyno comparison between Stillen duel, Borla duel, I think the Nismo and the SES and a few others. Believe it of not but they said the Borla did the best overall for performance gains. I was there.
I have the Borla and the day of my install we did before and after dyno sessions and my Z saw a 10.6 whp gain at peak and I think it was 8.9 more ft lbs of torque. At that time the system cost me $800 installed, dyno sessions free.
One more thing though is that the Borla duel is pretty light weight, about 45 lbs. if I remember correctly.

 

Wow I have always heard bad things about the Borla's TQ gains. I defiantly feel mine up top but my Nismo seemed to accelerate better at lower RPM's.

 

I went with Stillen and Alphawerks for exhaust and headers.

I wanted more performance across the entire power band. Alot of the other exhausts seem to lose TQ down low based on the tests they conducted in Sport Z mag except Stillen and Nismo.

I don't want alot more noise.

I'm hoping this will give me what I'm looking for

 

you gonna need some HF cats or some test pipes to!

 

mostly aftermarket exhaust system gvies 8 ~ 12 horse than. And nismo only10hp? hmmm.. $950.00 / 10hp = 95bucks per horse...hahah

 

NISMO is very conservitive with their numbers... And they are actually pretty realistic numbers...

Y-Pipe back exhausts claim ive seen up to 18RWHP! heck, greddy SP2 muffler claims 4 HP... o.. k..

I would trust NISMO's numbers over any other...

 

Did you guys not see the numbers i posted on the second page??? Sports Z mag did a dyno test on a few exhausts here are the number:

Here is a view from Sport Z Magazine:

Here are more #'s in order of ranking:

PEAK HP:
1. Borla 8.2
2. Stillen 8.1
3. Injen 7.6
4. Nismo 6.3
5. 5Zigen -3.4

PEAK Torque:
1. Stillen 7.3
2. Injen 5.1
3. Nismo 4.5
4. Borla 2.7
5. 5Zigen 0.2

Im pretty sure this was all done on a stock Z, it shows 6.3 for the Nismo.

 

Just so you know, Injen no longer sells the system they tested and I would find it hard to belive the current system dynos with those numbers.

Chris

 

Ya, though you can still find them on the net. I was actually thinkin about getting the Injen b/c I think the angled tips are sexy, I remember finding a place that had some left overs. You can fix the fiberglass problem by replacing the resonators with a X-pipe, people also claim this adds tq to the system.

 

Good luck finding the angle tip, it is a much better choice than their current offering. I think both systems look awesome on the Z and the stainless and weld quality is superb.

The fiberglass is from the back boxes, not the resonators, it's from the exhaust getting forced around the restrictor inside it. Reports say that a crossover mellows the tone and if it will get the Injen back to even stock levels of torque, it would be a big improvement. But you got to ask yourself, why spend 700ish on an exhaust that you need to mod just to make it work the way it should have new?

Then there is the pipe diameter questions.
If the stock cats come out at 2.5" diameter and Injen pipe is 2" is the step the exhaust makes or the size good for exhaust flow? Nissan seemed to think 2.5 was a good size and I am sure the bean counters would have said go smaller, if it would have saved them a yen.

So in that same vein:
The area of a 2.0" pipe is 3.14", so a pair of them is 6.28"
The area of a 3.0" pipe is 7.06, if you only have one, like the Nismo it's still more internal pipe than two 2" pipes.
If the area of a 2.5" pipe is 4.90", a pair of them is 9.80" so here is where you will probably start seeing gains with FI.

Keep in mind these calculations don't take velocity or firing pulse (eg, exhaust slug overlap, pretty minimal on a v6) into account, but you got to wonder if the Injen is really helping anything.

There are also reports Injen is coming out with a new system that has some kind of crossover in it. Maybe third time is the charm?

Chris

 

Fujitsubo Legalis-R!

Basically the same as the Nismo minus the y-pipe, and no DRONE!

 

I found left over angled tip Injens, but decided against getting it. They were willing to work with me on the price b/c of all its known problems, the reason I would spend the money on it and then mod it is basicly b/c I love the way it looks (and alot of people like the sound.)

I dont know much about the X-pipe mod, I have just read 2-3 posts about it and how it gave the butt dyno some tq back. Do you know if there 3rd one thats comming out will be angled tip?

I also didnt even know the Injen had 2" piping! In the end I will probably have the Stillen or mayb the Greddy evo2 (if i can find some good dynos tests on it.) Thanks for all your input man! You know a a$$ load about exhaust it seems!

 

GReddy EVo 2 is great showed 13 hp gain with 12.5 torque and sounds great