I'm going to go with the powerlab gt35r ST but I don't want a droning exhaust for DD. The Fujitsubo Legalis R Exhaust seems to be the BEST exhaust for DD due to it sounding close to stock at 65dB at 5K rpm (stock 53db). This exhaust has a 3" mid pipe but the dual exit pipings are only 2.35".

My main question is, I want to hit around 550-600whp on pump gas so will this be an issue? I know there's back pressure due to the exhaust but can't I just up the boost to reach my goal?

Will this really be consider back pressure when only a small portion of the exhaust is less than 3"?

 

Forgot to mention my setup:

CP heavy duty pistons 9:1
Eagle Rods
ACL bearings
L19 head studs
PE head gaskets
DW800cc
stock heads
revup oil pump
Nismo R cams
Alphawerk headers
Mrev 2+ with 5/16spacers
AAM stage 1 fuel setup
Koyo radiator and 2 slim fans
pathfinder cooler mod
Competition stage 4 clutch
GTM oil cooler
HKS VPRO
HKS knock
HKS CAMP2
Technosquare reflash

 

to be honestly if your going F.I, your going True Duel. With the numbers your saying i would get a T.D exhaust to make sure your not jipping yourself out of free Hp. Remember more boost doesnt always mean you get safe numbers. Ya, it seems like you could just up the boost till you get your goal but everything is going to be so restrain that you could put more wear on the engine and cause premature failure.

Of course this is coming someone with no experience (psychical) with f.i. This is what i felt and i could be wrong. just my .02

 

Wow.. I'm anxious to see the opinions on this, I have the same exhaust to include the X-pipe and I bought a Greddy Tuner with the same intentions you stated.

 

greddy is a different setup where u still retain your cats.

Single turbo i have no cats and the pippings are routed like a long Y pipe where it then connects to the mid pipe. A true dual will work but I would need a reverse Y pipe to connect to the true dual which means more money and loud exhaust.

I really dont see how I would cause more wear on the motor by turning up the boost. I just wont see as much whp per psi as a free flowing exhaust.

 

The exhaust sounds great and all, but I would stay away from a chambered muffler on an FI application.

 

how's the sound of this exhaust? is it loud in the cabin and while driving on freeways? If it is I might as well go with the JIC ST exhaust.

 

I would think the 2.35" exhaust exits would be your biggest issue...Pushing all of that air in a 3" down pipe to a a small exit will be very restricting..

 

Nope there's absolutely no drone whatsoever... I take my long trips in my Z and routinely drive about 3hrs to central Florida to visit family. It's a little throatier than the factory exhaust. I have stock cats but have the Y-pipe and Catback and it sounds amazing. It was definately worth every penny. Ill post a sound clip tomm or so.

 

As far as cats the newer 20g tuners have 3in one piece downpipes that mate directly to a cat-back system and don't have any provisions for cat attachments.

 

I have the JIC ST for trade

 

I had this exhaust and LOVED it, quiet around town and throaty when you put the pedal down. I was advised that the exhaust would be too restrictive for my fully built setup and traded out to the APS 3" true duals.

As much as my car backfires and occasionally flames out the exhaust I would not think the canister setup is a good idea.

 

550 might be realistic on pump but if your powerband looks like this, it wont be much fun compared to the vortech (although if those are really 280* cams, those are huge)
https://my350z.com/forum/shop-builds...es-653whp.html

But, I'd get that exhaust and then a 3" cut out from SP. Be way cheaper than any other option and still get no drone

 

Boosted Probe had some issues running a similar exhaust and posted about alog with his fix. I also remember a shop build thread with Jtran and a built PL setup that had stupid TQ also from a similar exhaust with possibly smaller diameter piping.. I would think anyone running these type of HP levels would stay far away from the OEM style exhaust.

https://my350z.com/forum/shop-builds...lab-gt35r.html

 

except thom0001 that runs 750+ thru a OEM muffler

 

+1 on the exhaust cut-out from SP.

 

Really? is it gutted? That by far sounds like the highest HP setup on a OEM muffler. crazy

 

I'm not disagreeing with u guys that this exhaust is restrictive but if this turbo is capable of making 650whp at say 22psi then for me to want to make 550whp with a restrictive exhaust isn't possible even if I set it to 22psi? I'm just not making as much whp for each psi like intense is 22psi but at the same time I'm not sacrificing my comfort while i'm driving this to work.

Am I incorrect to think this way?

 

^You have to worry more than just back pressure

Restrictive exhaust will raise your EGT's which can cause metal fatigue and breakdown

Your AIT would also suffer

 

it made 650 at 29psi and then tapered to 22 psi by redline.

But, restriction will cause your AITs to skyrocket and you'll be pinging well before you reach 22 psi.

But who knows for sure as it seems that IP used their house brand 3" OEM style muffler , yet Boosted Probe couldnt make 400 hp with it

In the end, run that Fuji. exhaust. If it doesnt make the power throw on a cut out.