So it has been said that on cali emission vq30 don't notice any gains with the y pipe installed. I did. But i think i can get a little bit more by removing the resonator and running a 2.5 inch pipe from the cat to the muffler...open to suggestions

 

No... It's said that you won't gain as much as the fed spec bit you will still notice gains.

Removing the resonator and going straight pipe will not gain you much if anything

 

Oh. Its still quiet though.lol. I wonder if i rake it off if she's gonna be really loud. When my friends wanted to hear it i told them they won't hear anything ( because if you rev her a certain way you won't hear the intake) . But while revving someone said it sounds like my cat is clogged. It can't be though cause i whouldve had a code for the precats and the car accelerates fine.

 

Are u auto? Stock muffler? I'm auto with a flowmaster muffler. Not as loud as a manual. If u run open headers then it's loud lol.

 

Yep Im an auto and yep stock exhaust. So you have a y pipe with a flowmaster muffler? That sounds interesting. The interior of the car with the windows up you can barely hear my cold air intake. But with the windows down damn that thing is loud. Im still debating though. If i wanna get run of my cat and resonator in the back.

 

Yea y pipe with flowmaster. With the intake its too loud so I went back to stock hacked air box. Removing the resonator will only increase noise. I don't know how that will sound with stock muffler, maybe too raspy.

 

I had a WS y-pipe with a hi-flow cat and a "Stillen" cat back that did not include a resonator and it was way too loud (to the point of being obnoxious).

I added a Magnaflow resonator inline and it's sounds much better with no reduction in power.

FYI - I originally had y-pipe on with my stock cat and catback and it flowed so well with the y-pipe, it blew the crap Mieneke muffler apart eventually.

 

On my 96 cali spec auto, I was able to tell the difference when I installed my WS y-pipe. The rest of the exhaust was stock.

 

Oh yea about the WS I read a lot of others experiences about it being farty. I have a WS as well. Maybe OP doesn't have a warpspeed?

Then again we all have different ears lol

 

Well i bought it off ebay. It at the moment...(yes i know its a bad visual) sounds like a 96-01 gm 3100 series motor. I plan on doing a 00vi swap. I mean i know ill he a little bit of gain if i just get rid if the resonator and increase the pipe size and yea power tothemax

The intake is loud. Lol.

 

That's pretty loud. Hope your neighbors don't hate you later.

Good luck.

 

Well i don't floor it around them. But she does intimidate quite a few people. Few if my friends are pissed cause they have a cai and it doesn't get nowhere near aggressive or loud as mine.lol.
A stock 3100 series isn't loud at all. Im surprised it doesn't sound as close to the g35. My neighbor maxima has an exhaust leak at the muffler and it kinda sounds like a g series.

 

http://forums.maxima.org/all-motor/3...n-95-03-a.html

I have both cali and fed spec and you can feel the difference, well when it was "stock" anyways.

 

The GM drone is from a stupidly long front pipe. The front pipe travels over the trans. The rear pipe shoots straight back.

The stock Y pipe is equal length. The new Y pipe is not. The exhaust pulses are running into each other and out of sync. The only way to fix this with with an original Stillen Y, which are as rare as unicorn fur, or with a set of Cattman, Hotshot, or OBX 3.5 (aka V2) headers.

 

Well said. And considering the price difference of the OBX headers, I still think that's a better investment than any y-pipe, even unicorn fur. I had unicorn fur, and went to WSP, and was very disappointed.

Decent headers give a solid, repeatable 20 fwhp gain. Y-pipes do not.

 

I didn't really notice any gains in HP when I put the Y on my 99 CALI Spec. What I did notice was a slight change in the exhaust tone and a slight gain in MPG.

If you want gains from a Cali Spec car, get Fed Spec Stock headers, Fed Spec Y pipe and a Fed Spec intake manifold. It will give you a nice increase in torque you can actually feel.

Between the Swirl Valves and pre-cats on the cali spec engines, we are the slowest 4th gens on the road.

 

I beg to differ. My i30 stock was giving stock auto de-k a run for there money. My moms de-k in her infiniti was one of them. With the cai alone i was able to beat my friends g20 that has a sent se-r tranny swap, headers full exhaust and cai. I thought about doing that but remember cali spec rear cats aren't monitored and if i get rid of the front cat i have to move both o2 to the rear of the cat.

 

So you raced your mom and beat a 4 cylinder.
The fact remains that the Cali Spec 4th gen is the most restricted motor.

 

Awesome.

 

Ok. So maybe i underestimate these motors i figured with the g20 with all the work that he's done and some of the integras and civic he be killing i figured my car wouldn't stand a chance also I've been told that the de-k is quicker than the vq. And like i said I've given quite a few a run for there money. Njmaxseltd i see what you mean with the swirl valves. I took a look under the hood and looked in the fsm so i applied vacuum and test drove the car...yea the performance is definitely noticeable. I guess mine doesn't work which is why i didn't notice anything.

 

DEK is a VQ.

And on paper, track, etc the DEK really isn't faster/quicker than a DE because it (DEK) is overmatched for the weight of the 5th gen chassis.

In any sense, NJ's right, pretty much as always. You're talking street racing here it seems.

 

So with the fed spec conversion would we have a CEL? Probably we will. What's a way around that ?

 

Do all Fed Spec OEM Maxima Y-Pipes include precats, or just the Cali spec?

 

Yep, they all do. The only thing that differentiates fed and Cali are the quantity and location of the o2 sensors, and the front precat on the Cali y is actually on the stock manifold, whereas on the fed it's part of the y

 

No im not talking street racing. I would love to get rid of the front cat to match the rear.there is a how to where this member looks like he switched the pinouts for a couple of sensor. But in the long run i love the improvement in power and mileage. Over the years I've gotten attached to my i30. Its kinda weird how we started a bond. i think ill just cut the resonator and call it a day.

 

[QUOTE=njmaxseltd;8834489]I didn't really notice any gains in HP when I put the Y on my 99 CALI Spec. What I did notice was a slight change in the exhaust tone and a slight gain in MPG.

I had VERY noticeable gains in my 99 SE-L, but only from 3100 up to redline. Took a few days for the car to really have the Cali spec y-pipe kick in though.

 

Well it seems my main cat is rattling since its not monitored can i just remove it if i do i won't lose any power or anything like that right?

And yes I've tried searching

 

Search harder. test pipes provide gains in the midrange. I've proven that more than once.

 

So...the test pipe is just a gutted or just a pipe in place of the cat. I won't be putting the cat back on...cause its not being monitored anyway. So it'll be all good then?

 

I had a TP and never had an 0707. Well, I did once, but it was because it was torn off by road debris, but not because of the test pipe. Mine was an actual test pipe, not a sleeved stocker or gutted. They go for 40$ USD I think. And take about 20 minutes to install.

 

Don't forget the header design, 3-1 > 3-2-1

 

As long as they're longer than OEM's, it's fine. All versions have shown similar gains.

the top 3 would make similar gains, the bottom one, not so much.




These are my Gen I Cattman's:






No problems as of yet.

 

They. Are. . Unequal. Length ... do. Mine. Look. Like. That.

What. The. Meagan Race Headers Look like i have. A. Set. But. I don't think They looked like. That i. Remember. Them. Similar. To the obx ons

 

 

This is an awesome thread, very informative.

 

It is. Nmexmax it might have taken you 40 minutes to do yours but my cat is rusted. I'll think about headers in the future but I'll also need to invest in o2 simulators. It shouldn't be that loud cause ill have my senator and muffler still

 

lmfao. i think he may have used his cell which messed up that post

 

That doesn't explain the lack of grammar in his posts.

 

Rust is FTL, get a grinder and grind those bolts off. Not fun, but worth it. I had to do that to my 5.5 gen when installing a cat-back.

 

Yea...my y pipe install was no fun either. But it was worth it. I might have it done this week. No one said if it was gonna be pretty loud or not...is it?