m3clubracer

From:
https://www.myg37.com/forums/newbie-...read-this.html

Has anyone done a comparison or has any feedback on one over the other?

zer099

iTrader: (2)

On the 370z forums I found a guy that went from the Stillen to the FI-LTH; he lost high end (above 7000RPMs, like we drive our cars there 100% of the time *sarcasm*) but gained around 6-8whp and some torque throughout almost then entire power-band. He had before and after dynos of both setups, so I feel it was a fair show of things. EXCEPT, his stillen headers were paired with a set of berk HFCs, and I do not know how much that took from the numbers. If he had some test pipes on beforehand it would have been a more fair comparison I feel, but that's something we can only wish for.


Here's the link to that thread.

m3clubracer

Thanks! I keep forgetting to go to a Nissan forum where there is more. I expected this to be the result. When your at the track (the one with turns) you do live between 3-7k rpm. Thanks again!

zer099

iTrader: (2)

Glad I could help. I get a lot of the performance insight on our engine from the 370z boards. I forget sarcasm is not heard via internet. I agree it is worth it as the mid gains are more then beneficial to everyone. I would still however like to see a comparison between header+test pipes and the long tubes.

chuckie311

iTrader: (3)

here maybe this will help you dyno of Long Tube VS stillen VS Z1 by the way all these were done on same dyno..

i gained 16whp and 3wtq with the z1 headers no tune all base numbers

Z34 Header Test & Tune |

G37 Sedan Header Results |

here is my post with Z1 headers

https://www.myg37.com/forums/engine-...-thread-2.html

zer099

iTrader: (2)

What were you running with the Stillen headers? OEM cats, HFC, test pipes?

chuckie311

iTrader: (3)

im not running Stillen headers if you read my post i said Z1 headers..
if you clicked on my link where i did a thread on it everything is in there

zer099

iTrader: (2)

Your right, I didn't click on the link but I have read the thread in the past. The graphs do not fully help sadly as they are still a dyno of a car with a header but a cat still installed trying to be compared to a dyno of a different car with a long tube on it being compared to a car with a host of modifications and a different set of headers.

However, the information does help and please correct me if I'm wrong it looks like your gains from the Z1 are about the same as the gains of a stillen (comparing the graphs from the stock g37 and your car before the tune). Which could be important information to some as the Z1 header doesn't fit an X, but the stillen is stated as it does (though yet confirmed), and the stillen is a tad less heavy on the wallet I think. And I'm talking rev range gains, not top end.

Your build is impressive, I imagine the shorter final make the dyno numbers seem lower but I'm sure she pulls hard on the road.


EDIT ADD: Ideally speaking the optimal comparison would be between a set of headers (be it stillen, z1, or whoever) with a set of test pipes and then with the long tube headers. Anything else is a bad comparison as there is flow restriction present that is not present in the long tubes. I imagine the long tubes have gains ultimately, but it would be nice to know how much of a gain throughout the entire rev range to help justify the price tag vs a short header and test pipes.