If people like the single maybe we'll fix the hole on the other side issue with a dry carbon insert to block it so it looks like OEM is supposed to only have one muffler. :stirthepot:

Just so I'm clear, you're going to dyno a stock car, add this cbe and dyno again to see gains? While that's great we REALLY need to see stock, this cbe and a normal dual cbe so we know what dual 2.5" and single 3" do. Then the ultimate test is a tuned car with test pipes and oem cbe vs tuned, test pipes and this cbe vs a tuned, test pipe normal 2.5" dual cbe.

Scott, thank you for all the research haha I am not familiar with all of that! Also, I am about to dyno my car stock today. removing the exhaust right now! lol as for the other comparisons i will have to find someone with an exhuast to come and compare.

whats up david,

the y back section will bolt straight to the BP kit. i did some research on this a while back. Just tell Sasha that its for a oem style exhaust. hes already made a kit like that!

Quick call someone haha

good read...assuming its correct.

How To Calculate Muffler Size and Exhaust Pipe Diameter - Exhaust Videos | Exhaust Videos

If you do the calculations on that website, then a 3' single exhaust is perfect for a bolt on Z. However, if I read everything right a 3' single exhaust would be a bottleneck for a turbo Z. Or am I missing something?

Good read for turbos.
http:// http://www.cobbtuning.com/Technical-Articles-s/70676.htm

On the BP kits it's a 3" exhaust tube into the fi dual 2.5, which I am told from hear say doesn't start to loose gas(pardon the pun) till 600, whp.

Just contacted soho motorsports looks like im going single.

why can't there be a design for a single exit exhaust that sits high like motordyne or FI and doesn't poke out as far out from the bumper?

I had an idea of using half of the FI 3inch system and custom welding it to mate a motordyne XYZ


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Amuse R1000 if you're curious.


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Someone go take off one of their fi cans or photoshop it....but it won't be drift style like all the subies...my biggest hangup would be like scott said the bumper cut out but that cannot be hard to fab something.

It will look like the Nismo RC exhaust.


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What's up guys! Got the car dynoed today again. Had soho do a baseline and then another pull with the exhaust. Overall it looks like a 6%increas in torque and 5% in power. 4th and fifth gear! Car does have stock intakes and stock cats. The dyno read a little higher than I was expecting. But I'm still very happy with a gain of 11rwhp and 8lb/ft of torque!! Picked up 15 lb/ft of torque all the way from 3500 to 6000. It was nice to see the jump from the baseline!

Here were the numbers
Red is base line
Green is stock everything and soho cat back
Blue is stock everything and soho cat back with fuel adjustments (tune)
http://i1083.photobucket.com/albums/...ps1vkg4r5l.jpg

So the Dyno did read a little higher then normal right? However with just a Y back you gained 8 HP. What kind of HP pick up fo normal axel backs make?

Yea it was. But still great power for a cat back exhaust! With just the axle back it picked up only 4 or 5 because the y oil was the choke point. Then with the y pipe it picked up another 8 on top of that with stock intakes and cats I don't think you'll see anymore gains. That's why it picked up so much under the curve but not up top. Some test pipes and intakes should help her open up the rest

So with a Y Pipe, Soho 3' and some test pipes it should be around the same HP as other exhaust just 45+ pounds lighter. I think that's a good thing, because the stock Y is where most of the bottleneck comes from.

Hey man. Edited my comment up there^ lol. But really it should make more. I need to look. And see how much other people are gaining without test pipes. (Percentage not numbers)

well now we know a little bit more, looks in line with the dyno graph on their website. as well, looks like a good single option if that is what you want. I would say the dyno reads about 20 HP high on average from other graphs I have seen, as well as all those 330+whp graphs they are pumping out, puts them right in the 315-320 range where they usually are tuned...anyway as long as you are happy with it that's all that matters, it is their y pipe right? I do not see it on the website.

most true cat-back exhausts from what I have seen make between 10-18 whp, Id say its about right.

Yessir. Yea that's their y pipe! I'm curious to see what kinda gains it would make with test pipes and intakes. I'm goung to do some comparing tonight when I get home from work.

Dropping the cats is a must if your looking for HP. Any short ram type intakes are a waste, needs to be long tube like stillen or takedas.

This is very true. Another thin I wanted to mention is that I want to look at a few other exhausts and see where the torque went. Because I was very surprised how much it picked up under the whole curve. Esp for torque. Can't just look a Peak numbers. Now just to figure out where the choke point is. either cats or stock intakes. Needless to say, the single flows plenty enough for our cars. And the boosted performance is a 3 inch collector so running it 3 inches out the back, without any transitions or crazy bends, should make good freakin power

Also, why wouldn't I be happy haha. I picked up 12rwhp and 8lbft of torque with just a catback. Still have the factory warranty and everything because the cats haven't been touched and the car doesn't need to be tuned

It's def a good option to go. As far as I know the FI exhaust had the best catback pickup and that was 20 hp and 11 tq. This did around 14 and shaves good amount of weight. The average catback is around this amount of HP

I think with test pipes, stillens, y pipe and the catback you could see some impressive numbers

here is the FI dyno graph.

http://370zexhaust.com/370z-fast-int...haust-dyno.jpg

Idk man. I'm looking around right now and it looks like I've gained a little higher than a few other exhausts. Especially in torque. I'll look around later and get legit comparisons. True on the weight though. The entire exhaust including y pipe weighs 17 to 18 pounds. Also sounds mean AF

Yea the FI puts down good power. So weird though. I picked up more across the board but less up top. Look at how my torque curve jumped up 15 lbft early

well overall its a solid performer for sure, dunno what the whole thing cost cause I do not see the y on there site but if they sell it sub 1k I think they will sell a few ;)

I'd imagine it to be around 1-1.2. Just because the axel back is around 650 and I'd imagine the Y pipe to he between 3 and 5 hundred.

The y pipe fits the 350 and 370 so it is the same! I believe its a 1200 dollar setup

I bet if we can get 5 sold at once they would cut us a break

It never hurts to ask!! More single bros for the win. You won't regret the sound!!!! Lol. Sounds like it eats little children

Been looking around and it looks like it performed better than the tanabe, ark, Nismo s-tune, invidia gemini, and the agency power. All duals and 2.5 inch I believe. It's a give or take with the still between torque and power and the FI tDX got it up top. I'd say it gives a lot of people their run for their money haha it sure if I want to keep modding my car though. I just want boost

Im in on a group buy just want the axle back !!

It really depends on what your doing with the car to be honest, the reason I hang around the forums is I am considering buying another Z, while boost was a blast, there is more up keep, and actually overall lost some joy with the car when doing tight twisty driving, which where I live now has a ton of great driving roads and a 500+ whp Z would not be the best car for enjoying them. I think if I bought another Z I would take all the money I spent on boost and put all the money into suspension, diff etc, and make one mean NA handling Z, then when the new hopefully factory turbo Z comes out, have my boost fun with that car.

Already available.

Trust me I know haha. I would do half mile events and airstrip runs. Also a fun weekend car. I've has the car for a year and 5 months and have been in the twists once. Sad but true. Also a good boosted car is fun on the track as well. That's where the purpose of the build comes into play. Small twins for instant boost at a low rpm or a big good turbo to make lots of pow pow uptop. Oh and race my brother with his boosted 5.0 lol

Where?