I finally got my first performance mod for this car. I have had this car for two months now and am ready to start going crazy with it. Well here are the pictures.

-Chris





INSTALLED (The wet stuff is WD40)

 

That's NOT A CAT. It's a straight pipe meaning it's not a performance part either as you actually lost torque. You will also fail emmisions with it as well. Also WD40 isn't meant to be used to remove rusty parts and such. It's a lubricant not not a penetrant. Actually it isn't even a staright pipe, it's more of a muffler/resonator.

 

Nothing like getting all happy, and then having your feet kicked out from under you! Seriously, we have all been thru something like this in one way or another, don't sweat it! Speed cost's, how fast do you want to go?

 

God I love it when Big D posts. No BS. Anyway hes right thats not even a cat that just looks like a bolt on resonator. And I dont think you have actually seen the inside of a catalytic converter nor do you know how it works. Iam suprised that thing even bolted right up like it did.

 

I wish everyone felt the same way about my posts as you do. That thing is actually made for maximas so that's why it fit(check ebay).

 

I just started doing that. Maybe Ill pick one up for my car. lol

 

YOu should have read a little more and spend about $180 on a y-pipe from Budget. That would have added like 15-20 hp at the crank.
What you put on, probably did nothing but add a little different sound to the car.
Sorry to break it to ya.

 

its a quiet straight pipe, and how does having no cat make you loose torque?

 

Actually WD40 is a water dispersant.

That certainly doens't look like a traditional cat. I don't see how it could covert anything as most of the flow would go right through.

Maybe the poster can elaborate where it got it and give us a link.

 

Ouch...

10 chars.

 

It's an ebay part that claims 5-10 hp! lol highly unlikely

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2480045517

 

This is what the inside of any cat should look like. I search ebay and yours looks like the "high flow cat" that people are selling. ie.. not catalytic convertor. It seems "cat" is a term used VERY loosely on ebay

 

That is a resonated straight pipe, not a cat.It wont do much for you if you are not FI. Dont listen to certain others cause they will flame if they do not have it.

 

Every term is used very loosely on ebay. Most of the time, the people on there selling stuff don't know what they are talking about.

 

looks like polished resonated race pipe, someone correct me? I dont understand HOW these can slow you down?????????

 

presumably from a loss of backpressure. You need some to make low-end torque (I guess you can liken it to pushing off starting blocks in a sprint). However given that this is his first "performance" mod he has more than enough backpressure.

 

backpressure should always be reduced and thats what you want out of your exhaust system. i think wat he means is that it may not allow for a steady consistent flow of the exhuast gases. i have the same straight pipe and it looks good whenever the car is jacked up.

will

 

not enough back pressure can hurt you just as much as to much back pressure.

 

Don't you all hate it when someone starts a thread, then after someone points something out, they don't reply again?

 

I think he's embarrassed that he wasted his money, personally.

 

Sorry I haven't posted all day Big D, some of us have something called work. I can feel a differance and even my girlfriend who had no idea I did this felt a differance when driving my car. As for it not being a performance mod, I believe changing this on your car is a modification and it does affect the performance so I would say it's a performance mod.

-Chris

 

Wasting my money? If you can't afford to shell out $45 bucks there maybe something wrong with your money handling skills.

-Chris

 

Don't turn this into a big debate. They are right that this did nothing. Theoretically it helps up top and the debate about torque is all about whats proven on the dyno. Torque seems to be an illusive member of performance that isn't very predictable. Still, you wasted your money seeing as you could have spent $15 and actually gained some power. This is a weird thread coming from an older member.

Alright, enough about backpressure. It doesn't exist in a modern four stroke engine.

 

Actually this is the first thing I have done to this car, I have had it for about two months now. My last Maxima was totaled March 4th. This is something I didn't do to my last car.

-Chris

 

anyone know the inlet of these resonated straight pipes? this is EXACTLY what i want but in 2.5" piping.

 

high flow cat? Wheres the honey comb? thats a janky straight pipe with some padding in it. lmao be careful with what you buy on ebay my friend! Props on the install, those bolts can be a *****.

 

Oh well, it's a resonated straight pipe, sorry for the confusion. I can feel it on top end and can't feel any loss in torque so I feel it was worth it and thats all that really counts, thanks for all the criticisms guys.

-Chris

 

i have the same thing and i dont see it as a waste of money... no power loss and i needed mine since my old cat wouldn't come off after i added my y-pipe. so i saw it as a great alternative to buying a new cat or even a hiflow one. the way i saw it if i got rid of the other two cats then y even bother with the last one. ohh and please nobody ever say that backpressure is a good thing.

 

I just noticed VENOM that you forgot the U in LIQUID.

I however diagree with you on the backpressure thing. If you have ZERO backpressure it's just as bad as having a lot of backpressure.

 

Isn't it funny how all the people that have the pipe have good things to say about it, and the only ones that don't have anything good to say are the ones that don't. They may be bias opinions but they still like 'em.

-Chris

 

just give it some time. Once your CEL comes on and you have to start thinking of ways to make your ECU beleive there is a working cat there, then youll think differently.

 

Well I said that because I saw the dynos for it. You DON'T have a straight pipe. You have a resonator. A straight pipe is just a normal 2.5" pipe with flanges at the end. What you have has holes in it that draw air into the fiberglass packing all around the pipe to quiet dwn the sound. The gain you feel is obviously in your head as a staright pipe on a N/A car does abolutely nothing. There was a dyno with a 1hp gain and 1tq loss. There was also another thread made by some company who was making them for vaoius other nissan cars and truck and by adding in straight pipes instead of the cat converter they actually lost like 20hp/27tq on Nissan armada and around 2-3hp on the max.

 

its a proven fact that you need some back pressure for a healthy idle, and for torque. however removing the stock cat and adding that, with no other mods probably did help a little. its cool if u like it, it doesnt matter if people on the internet dont like your car. all that matters is that u do.

 

somebody help me here because my head is begining to hurt. hp is derived from tq, so how can a loss in tq yeild u a gain hp. im looking at the formula and i dont see how u can lose tq and gain hp.

 

Oh well, I plan on going turbo sometime this summer anyway. So I guess it's not as big of a waste as everyone says, but thanks for the input.

-Chris

 

The loss or gain doesn't have to be at the same exact spot. It's just like most mods where you gain hp and only get torqe that is a fraction of the hp you gained.

 

big d u make a good point.

 

Okay, Hp is derived from TQ. Keep in mind that they are equal at 5250 RPM. Generally TQ decreases above this point in relation to HP. In most cases when discussing losing TQ and gaining HP, people are talking about peak power. It is possible to gain 1 HP at the peak while losing 1 lb/ft of TQ at the TQ peak or under. Max HP will ALWAYS peak at a different RPM then TQ. When it comes down to it, peak power makes for an impressive conversation, but it's the whole power curve that counts. A car that makes a huge # in a narrow RPM range will always be slower than a car that makes a little less power, but has it spread out over a longer range. Hope that's not too confusing. I probably didn't even scratch the surface of that topic!

 

Nope. ZERO back pressure is actually ideal, but impossible. What causes the low-end torque loss with piping that is too big is the exhaust has a chance to slow down and cool.



Look at the MEVI. It causes a torque loss in the midrange and lowers peak torque but makes more torque after 5500 RPM than the USIM which is why you see the huge HP increase the closer you get to redline and beyond redline.

 

HP and TQ are the same at 5252 RPM. And TQ will ALWAYS be lower than HP after this point. It's a function, so that is constant.