primariy differences with HFC's are cell count (200 or 300 [lower cell = freer flowing]), if they are metallic or ceramic, and whether they are resonated or not.

I just dyno'd 321/268
G3
Test pipes
Stillen exhaust

NO TUNE!!!

What type of dyno?

Dynojet,
I'll email you the results

Looking at the graphs, the TP's and exhaust are done in 5th. And when the intake is put on, it was in 4th. 5th cut out because it hit the speed limiter at 6700rpm and was still pulling! 4th gear ran up to red line, and did make the higher number. Everywhere in the curve though is showing the first run would have made more power than the second. But running in two different gears skews the results slightly. I think your second set of runs if done in 5th gear will paint a better picture, even if you can't take it up to redline.

Having said all of this, you either have a freak car or that dynojet is being generous! Both dynojets I ran have me down 11whp and 22lbft. Not that we can directly compare them, but my mods list was pretty extensive. Even if I swapped out my cat for a resonator, I might equal your TP's and exhaust number. Not only that, but your a 7AT. Either way, your numbers make good forum fodder.

If your near GTM, maybe run a pass or two there and then we could directly compare! Though admittedly, my car did not have time to acclimate to the elevation and weather change and only had one pass. GTM pulled it off the truck, and backed it into the dyno lol.

This is my dyno from a few weeks back as I wanted a baseline for where I was at to where I'm gonna be after my Momentum headers install, intake manifold and a tune. This is on a 6sp. Run 3 was actually in 4th gear and 1,2, and 4 were 5th gear. My AFR's actually look amazing for no tune! Just a little rich at the end. Bolt ons are K&N intake, Stillen HFC's, CNT Exhaust. Havent been back yet as my test pipes are taking longer to get here then originally estimated..... They got shipped by boat instead of air....
New dyno's will be with Momentum headers, Top Speed resonated test pipes, and a pre and post tune. Then probably another one after my M370 manifold.
http://i184.photobucket.com/albums/x...7896892651.jpg

BTW!!!
The reason I sent those were as a baseline with mods vs MY intake manifold

Glad you liked the dyno run, I'll get the print out of a stock run on the same dyno... Not MY car though

And SS:

You pay for the dyno runs, I'll go run there!:tup:

Screw you all and your freak motors! Mine did 265whp (SAE Dynojet) 222 lbft tq stock. Don't get confused if you look at my dyno's in my thread, most are in DIN, I was converting it with Winpep.

:icon18:


I'm sorry

Is the nismo exhaust with stillen headers a good set up?

stillen headers are garbage. basically just a shiny version of oem headers. Nismo or Nismo S-Tune exhaust? either way for a little more better could be had. If you arent doing the headers yourself, i would a) spend the money on a FI or PPE longtubes or momentum short headers or b) get test pipes and call it a day unless you have money to spend. Header install is probably 6-10 hours of install time depending on who does it so factor in about $100/hr of labor and it hurts. took me about 7 hours to install myself.

So what is the best hfc to get on a Z between berk and invidia?

I like my invidia pipes. I think the sound and work awesome. I think honestly pipes are pipes. I think the only thing that would make any kind of difference and no really on HP is the o2 bung. The matched up nicely and fit properly. That's pretty much all I wanted. I wish I had some headers and Looking and reading the single pipe versus one piece molded are more efficient .