optimal MM size for best performance from an exhuast....

[Adiaz360]

ALRIGHT, i've got the aem intake and love the power i get after 3500 RPMS but now its time for an exhuast system b/c i need a little more response when i mash on the gas......so i'm looking around and i don't really want TANABE only b/c it seems like everyone is getting that for their versa...i'm looking at maybe this....tell me what you think Apexi N1 ExTi Universal Muffler 85mm Pipe 115mm Tip

Now heres my real question, at what MM pipe should i get to get the optimal amount of response for my versa....any suggestions would be a great help...thanks

A.J.Diaz : Blk 6spd Versa Owner

[bone_stock_240]

So is the Apex'i thing just the muffler? Or is it a catback. If it is just the muffler it won't do much of anything other than make noise. If it is a catback, it won't really do much of anything either, other than making noise. Huge exhausts don't really do much on naturally aspirated engines, especially such a small displacement one. I could be wrong though, I am sure other people will be chiming in soon.

[Ever Victorious]

That depends on just how restrictive the stock exhaust is.

What many people who put big exhausts on their car don't realize is that you need SOME backpressure in the system, and that there IS such a thing as too big.

On a 1.8L NA engine, you start losing more performance when you go to 2.5" or higher. The absolute maximum you want on this car if you're not turboing it is 2.25"... and even the only if you plan to do more mods to it to justify needing that much flow.

Most stock exhausts on 4-cylinders are going to be 1.5 or 1.75". I haven't measured the V's (and I can't cause I don't have one right now). If there is someone out there who has a measuring caliper, it might be nice to know the pipe diameter.

Anyway, another factor in exhaust is whether or not the exhaust is mandrel bent (as opposed to crush bent). Crush bending is cheap and common. Mandrel bending is expensive and harder to find. In a crush bend, the diameter of the pipe gets smaller in the middle of a bend because, well, the pipe is crushed a little to bend it. In a mandrel bend, the diameter of the inside of the pipe stays uniform throughout the curve, allowing better, smoother flow.

Now... that said... an exhaust will give you a little more power. Expect gains from nothing to just shy of a CAI... and if you have a CAI, there will be a small synergistic increase for having both installed as well. Exhaust gives you better gains the more you free up the breathing on the car, from front to rear.

To truly free up the system, you also need headers and a hi-flow cat. However, to the best of my knowledge, noone yet makes headers for the V.

[CodeRed]

You could just wait for AEM to release there cat-back system and that would probabl;y be your best bet since it is most likely dyno tested.

[ShusterVision]

To truly free up the system, you also need headers and a hi-flow cat. However, to the best of my knowledge, noone yet makes headers for the V.

I am really waiting for headers to install. I am sorta pissed that there is so much to offer for the fit and there is nothing for the V. Well nothing, you know what I mean. Headers will complete the set of most V owners here and many of us have a CAI and an exhaust.

SV

[benchthug]

the bench suggestion...

Dont go for the muffler yet or even a full cats... the reason is if you decide to get a body kit you will have to reweld or even cut and weld that exhaust to fit the new body kit... well if you dont go for the body kit i will still hold on it till i get a better manifold... im waiting for some company to release a manifold so i can plan on my high flow cats and then i will start thinking about the exhaust... having a loud car wouldnt do much if your car aint pushing what it sounds like its pushing hahaha... thats what i think :p if i were you ill buy mds voltage regulator to improve your timing and better fuel burn... because you already have the CAI... but its not a cheap upgrade though so think about it before you get smoked with other performance car that will challenge you because you sound like you have something in there or think about why are people laughing at you because your exhaust sounds like tin can... :P

think think think...

[bone_stock_240]

the bench suggestion...

Dont go for the muffler yet or even a full cats... the reason is if you decide to get a body kit you will have to reweld or even cut and weld that exhaust to fit the new body kit... well if you dont go for the body kit i will still hold on it till i get a better manifold... im waiting for some company to release a manifold so i can plan on my high flow cats and then i will start thinking about the exhaust... having a loud car wouldnt do much if your car aint pushing what it sounds like its pushing hahaha... thats what i think :p if i were you ill buy mds voltage regulator to improve your timing and better fuel burn... because you already have the CAI... but its not a cheap upgrade though so think about it before you get smoked with other performance car that will challenge you because you sound like you have something in there or think about why are people laughing at you because your exhaust sounds like tin can... :P

think think think...

To summarize,

Dont be a ricer!

[benchthug]

i like this icon hehehehe...

[Adiaz360]

yea your right, i've taken everything into perspective, I AM going to wait for someone to come out with headers for the Versa, before I buy my CatBack, it just makes more sense to buy it all at once. I'm just going to throw some wheels and a drop on it for now and until the headers come out i'm not going to do anything else under the hood (Not like there is much to do)

[versa2nr]

or you could just have the exhaust reworked to be a mandrel bend instead of a crushed pipe bend. I am looking to do a truly NA tuned ride and see where I can get from that. My ultimate goal is 200 Hp at the wheels on the versa but I think a turbo or sc would be required. If I can get it o a true 130 hp at the wheels with the car NA then that woud be good with me.

[bone_stock_240]

You will not be able to make 200 hp at the wheels without forced induction in the versa, ever. No chance. No room for differing opinions.

[versa2nr]

You will not be able to make 200 hp at the wheels without forced induction in the versa, ever. No chance. No room for differing opinions.

Young grasshoppa should read more closely

or you could just have the exhaust reworked to be a mandrel bend instead of a crushed pipe bend. I am looking to do a truly NA tuned ride and see where I can get from that. My ultimate goal is 200 Hp at the wheels on the versa but I think a turbo or sc would be required. If I can get it to a true 130 hp at the wheels with the car NA then that woud be good with me.

[bone_stock_240]

Yes, I read that. I was responding in reference to your ultimate goal. And I said that it is impossible to do it NA, meaning that you will definately have to do FI. Logic owns you. By saying "I think a turbo or sc is required" leaves room for maybe considering doing it NA. I just reinforced the point that you will definately need to do FI. Of course 130 NA is totally reasonable.

[versa2nr]

nevermind....read with understanding next time.