those exhausts really make that much whp gain?
 

went to dyno with a friend, he only has CBE(with y pipe) changed, other than that his car is all stock. The problem is the hp gain was not even close to what manufacturer claims. That made me wonder those manufacturers claims 18whp or 20whp gains on exhaust are even true(without tuning)? Not trying to make any company looks bad, just wondering cause I am in the market for exhaust myself, thanks.

Ah yes. Marketing departments.
They tend to run numerous dyno passes and record the highest gain. Average gain would be more honest, but it's a case of "mine's bigger than yours".

Not all exhaust systems are going to yield massive results... some are rather poor actually... the Fast intentions seems to have the highest numbers with a full CBE with test pipes getting about 25 or so whp.

I myself would likely go with their exhaust with the Motordyne ART test pipes, their pricey, but they aren't as loud as test pipes, but have gains over all test pipes so far that i've seen... but there could be some out there that do better.

The more expensive exhausts are USUALLY expensive for a reason... they get results.... but that's not a hard and fast rule either.

It also depends on the type of dyno and the temperature as well.

you're doing pretty well if you see half of what they claim.

yeah, good point.

I saw (I believe this is correct) a Z with a FI exhaust and test pipes, G3 intake and Stillen headers make 324 hp at the wheels. I don't know if that's the highest out there for an NA Z, but I haven't seen in anyone's sig more than that... but that doesn't mean it can't be done.

raw numbers mean less than nothing.

I felt a good gain from headers and catback from F.I., no dyno though. With intake and tune put a solid 334whp and 252wftlb

It also ran 317 hp on a dyno dynamics... does that mean nothing also?

When I installed my Berk cbe, I definitely felt the difference on the butt dyno :P

means nothing without a baseline taken immediately prior, and then only the delta matters.

http://i36.photobucket.com/albums/e3...26_4281768.jpg

^ that graph, with a couple of modifications to correction parameters, can yield as low as ~450 whp and as high as ~1000whp.

exhausts are tough because the extra sound always makes you feel faster:tup:

I understand that without a baseline it's hard to tell... however, based on what your average 370 baselines at, those are pretty good numbers.

yeah, but you don't know the oddities with that dyno/conditions unless you run a baseline. I can give you 400 whp on a stock Z if you want it, and you won't be able to tell what I messed with.

lol ok ok... It's not that big of a deal. He asked about exhausts so the F.I. exhausts have baselines and then after install... they are all over 20 whp gain... there you have it I suppose.

OP-you don't mention brand. What brand exhaust was it?

I like the tone of the Invidia with the ART TP's, but i'm not that impressed with Invidia's numbers to be honest.

True, but a bunch of other people felt the difference as well, but that could have been the sound too. I swear I saw the speedo go up quicker than before when I got into the triple digit range :p

gtfi

I'm trying but you're all the way in Bama. According to the butt dyno, I should be able to get there quicker now :roflpuke2:

timer starts now.

:eekdance: :driving:

I just have hard time believe that you can gain 20whp just by exhaust. Again not calling their are a lair but from what I understand, Nissan engineers did really good job on 370z, I can understand Stillen Gen3 intake add HP, but exhaust? Any FI owner had their car dyno?

The stock exhaust is actually very restrictive compared to aftermarket ones. Whichever breather mod you do first (intake, exhaust, test pipe/hfc) will give you the most gains. I think the exhaust and test pipes/HFC help more than intakes though.

Baseline dyno was 296 whp. After I installed the F.I. LTHs and F.I. CBE I redynoed a month later and got 326 whp. +30 whp with only those two mods and no tune.

I don't have a dyno but I have a decent feel for my car. I put 5K on it before I modded it. I installed a Topspeed CBE and it it felt a little better. Still rather quiet but a nice deep tone. A couple weeks later (Sunday night) I installed a T/S y pipe and Surewin (cheap ebay) test pipes. It is much louder and kinda of fart can sounding over 3K rpm. I haven't really ripped on to see how much it changed, but I lights up the VDC light on gear changes like it did stock in the winter. I have sport tires and it was 107 F today. The sport tires are not very tacky in single digits.

I also went from averaging 20-21 mpg/tank stock
23ish just T/S CBE
now with 1/4 tank burned I am hovering around 24.