Custom Dual Exhaust For 350gt? Will I Loose Or Gain Kw

[arnie_350gt]

Hey guys i have recently bought a 2004 350gt, i was looking at getting a custom exhaust system made, i was thinking about having 2 seperate 2,5" exhausts with a high flow cat and a high flow muffler on each one coming from the extractors, will i loose power because of too little back pressure, will i have to get a new ecu/tune. Has anyone tried this? Your help would be grately appreciated.

[V35 Matt]

You might gain a little, but the sound will be a hell of alot better.

2.5" seems to be the right size for N/A cars of this nature.

Possibly even smaller, say 2 1/4"

[kessian]

From what i believe changing the exhaust over on a V35 with give very little gains. As far as i can remember, someone over here changed headers and full exhaust and only got 6kw gain. So as far as money goes it seems like a waste.

Although it will sound a hell of a lot better!

[scathing]

You will gain power in the top end. You will lose power in the midrange.

I know several people who've tried true duals and had this issue. The installation of a cross pipe mitigates the problem to a certain extent. But not completely.

Compared to an aftermarket exhaust that runs a 2.5" Y pipe into a single mid pipe you'll see a few more rwkW on the dyno that you're not going to feel in the real world, but the car will feel noticably less strong while trying to rev up there.

[dannyw]

You will gain power in the top end. You will lose power in the midrange.

I know several people who've tried true duals and had this issue. The installation of a cross pipe mitigates the problem to a certain extent. But not completely.

Compared to an aftermarket exhaust that runs a 2.5" Y pipe into a single mid pipe you'll see a few more rwkW on the dyno that you're not going to feel in the real world, but the car will feel noticably less strong while trying to rev up there.

nicely said, totally wat i feel after my fujitsubo. BUT!! taking into the consideration of the sound and look?? It's worth it~

But, do u mind me asking, comparing the true dual and y pipe, which would you prefer??

Also, any idea if true dual (example aps 2.5") will be louder than the fujitsubo? I have no chance to hear it anywhere

[arnie_350gt]

seens there are no viable power gains from the exhaust what is the best bang for your buck na mod the keeps the low down torque and gives a decent gain, i have been looking at a hatech interceptor ecu piggyback has anyone had a ecu tune with a stock motor? what kind of rwkw would be gained with a ecu tune?

[dannyw]

a proper ecu mod will probably starts around 2.5k, including tuning.. gain? haha

[scathing]

But, do u mind me asking, comparing the true dual and y pipe, which would you prefer??

I'd prefer a Y pipe, since I like keeping my car drivable. Loss of midrange is not ideal for a street car.

Also, any idea if true dual (example aps 2.5") will be louder than the fujitsubo? I have no chance to hear it anywhere

It'll boil down to the muffling rather than the plumbing. The APS 2.5" true dual has two mid mufflers (or resonators) as well as the rear muffler. APS says that, with the turbos in place, the car is ADR noise legal. While the turbochargers do muffle the exhaust gas, they also do cause a fair amount more of it to pass through the exhaust.

When I ran my HiTech exhausted 350Z on a dyno on the same day as another NA 350Z with an APS true dual, there was almost nothing in it when it came to volume.

I'd only look at going true dual if I was building on off-street car, or something with twin turbos. Even supercharged, I'd probably prefer the superior scavenging effects of the Y pipe but with a bigger diameter than what you'd use on NA.