I am looking for a true dual exhaust for the Z which is 2.5" all the way back. As far as I know, APS is the only option, are there any other exhausts available? How do they compare?

Thanks!

Chris

 

Stillen but at one point the pipes do "X"

 

HKS has a true dual 2.5" also, just put one on a customers car and it sounds INCREDIBLE, has titanium tips, and is full polished stainless, it fit up perfect, and the tips have about 1" of adjustment to suit your tastes for how far they stick out. part # 32009-BN001 i believe... its a bit expensive tho with MSRP at 1895... you might be able to find it for around 1500... its the only dual 2.5" that I know of that uses a twin straight thru canister mufflers rather then a stockish looking one like the APS and my borla.

 

Whats APS, 2.25" ?

 

We have seen the best TT gains by far on the Stillen unit, but have not had the opportunity to try an HKS yet.

 

SSR Engineering can make you whatever you want for ~$700-800.

 

So I am leaning towards the APS 2.5" true dual exhaust at this point, with test pipes.

I have been thinking about this subject alot though. I built an S2000 which pushed 559 rwhp at 23 psi of boost with a 3" exhaust system. So that is 2 liters, 4 cylinders being pushed out of a 3" pipe at ~9400 rpm. I am shooting for similar power, with less boost, and pump gas.

Now I have a 3.5 liter motor with two 2.5" pipes, so that's 1.75 liters with 3 cylinders out of 2.5" at say, 7000 rpm. I am not sure how much the max RPM of the motor matters, or the number of cylinders in this scenario... but:

The equation for an area of a circle is a = (pi)r(squared) -- however you write it out.

The area of a 2.5" pipe is 4.90625", the area of a 3" pipe is 7.065". The difference between the two is 31%. The difference in displacement from 2 liters to 1.75 is only ~13% however, so the 2.5" pipe is still somewhat smaller - relatively - even though there are two of them.

The question is though will the two 2.5" pipes be enough for 550 rwhp? Will it be enough for 600 rwhp? I am not really interested in much more than that honestly...

What do you guys think?

Thanks

Chris

 

We routinely push 600+ rwhp through dual 2.5" pipe exhausts on our Z32's (3 liters), so I don't think 2.5" pipe will be the limiting factor in your case.

 

<--573 rwhp at 14 psi thru twin 2.25"

 

for comparisons sake, what's people's opinion on one of the bigger 3" Y pipe design like the nismo or fubijitso for FI?

the area of dual 2.5" exhaust = 9.8125"

single 3" = 7.065"

 

Realisically, on our 3.5L V6, anything above 2.5 inch true dual will provide no benifit.

Like Phunk, I am also running mid 500'whp range through the Greddy Evo2 exhuast, which is 2.25 at best....

 

don't forget the Ultimate Racing dual setup...





dual 2.5 piping throughout, mufflers are 2.5 inch inlets as well with 4 inch tips

 

Chris in terms of exhaust system performance on a turbocharged engine you really need to look/measure the exhaust back pressure - an ideal exhaust system should have near zero exhaust back pressure at peak power.

Exhaust tube diameter is always one important factor to consider though in reality you need to consider tube diameter and muffler flow in combination as both of these parameters impact on gas flow and exhaust back pressure, hope this helps.

Peter

 

DC Sports is 2.5" True Dual all the way

 

How about two 3" cut outs? Got this off another post. Check out the vid on the bottom of the page right side. looks pretty cool.

http://www.atpturbo.com/root/releases/release091004.htm

 

IMHO the 350z is already a fairly complex vehicle. added complexity leaves more room for problems. gadgets should be avoided by all costs... i would rather just get a decent exhaust that will allow me to make good power all the time... to add in cutouts sounds like a pain, they might leak? i would rather just remove my exhaust before going to the track and save weight while im at it before running a cutout... thats just me tho... to each their own. i keep my exhaust on anyway... i like to hear what going on with the engine if i can.

 

I wouldn't have the ***** to try the cut outs. You could take them off if it was too loud, but your exhaust would be all hacked up.

 

Chris is you're really thinking about 600 WHP then a true dual 3 inch system would be the ideal exhaust solution - I believe you will find the exhaust back pressure will be very high at 600 WHP on a true dual 2.5 inch exhaust and this will be power limiting on the VQ engine.

Peter

 

619whp at 17psi, with helix test pipes, JIC ypipe and a custom 3" single exhaust.