O.K so iv been trying to come to a conclusion of wether a 3" exhaust would be any good with a na setup.. iv read the thread about some of the 5 gen guys going with a 3 inch.. but idk if that realy pertains to our cars being its a dual set-up and what not. basically im looking for some input from some knowledgeable members on this subject my exhasut has fallen apart do to the slam and some rail road tracks and i figure if there realy is a gain to be made from this ill do it now... so yea whats up guyss

 

Im not an expert when it comes to Maxima performance,but to me a 3" would be way to big.You'd probably loose to much back pressure.I used to have a Mustang Cobra(V-8 apporx. 350 hp) and that only used a 2.5".

 

thats kinda what i was thinkin but then i read the thread about the 5th gen makein more power with a 3" so idk

 

Not a good comparison. Cobra is supercharged V8. I have 2.5 from Y-Pipe to Mufflers that are dual 3in straight through design. there are clips on youtube.

 

I have a mandrel bent 3" exhaust.

 

Get the 2.5" or even 2.25 but 3" is out of the question.

 

I wouldn't consider it "out of the question." Have you checked the dyno threads? ~15whp over the 2.5" Cattman. There are many other things to factor in other than just OD. Build quality is a big one as well. I'd talk to Brian Catts regarding the matter, I'm sure he'd have some quality input. Too many people disregard the 3" for NAs simply because they are stigmatized into FI cars being the only ones needing it...

 

I shouldve explained it better...3" DUAL exhaust would be out of the question...3" single is a different story

 

What size is your existing catback pipes? I would get a Y-pipe instead, you will get a better kick from that as opposed to going 3" with all the stock exhaust parts up from.

Deus has headers and Y-pipe to go with his 3" exhaust.

 

the xisting size is irelevant being i have to do something with it i caught it up on a rail rd track and ****ed it up the time and effort i gunna have to put into peiceing it together may not be worth it if there is a gain to be made with a 3".... i will get a y-pipe at some point just been caught up doing other mods.[quote=Apollos2;7054770]What size is your existing catback pipes? I would get a Y-pipe instead, you will get a better kick from that as opposed to going 3" with all the stock exhaust parts up from.

Deus has headers and Y-pipe to go with his 3" exhaust.
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Ahhh, didn't realize your catback is jacked. If you eventually plan on doing headers and Y-pipe then I might think about 3in exhaust. If not stick with the 2.5, still bigger than stock anyway. (I believe stock is 2in).

I'm running 2.5 all the way from my headers to the Nismo catback. Would .5 more inches really help? I don't know.

 

when i had my 5.5 i had cattman headers and y- pipe and the diffrence was nite and day... i will def do headers and a y just have mony tied up right now... idk i guess ill just keep the 2.5... just pondering as of now but whata you think about a true duel set-up

 

A single 3" exhaust will make more power than a 2.5" exhaust hands down.

I have seen it done on many NA cars.

 

And can you show some dyno of these cars and mods ?

a 3 inch exhuast is not going to do anything for any 4 cyclinder.

so I assume these cars are V6 and up.

Would like to see some dyno , bigger is not always better.

 

Here's for starters, a 5th gen where the only difference between the runs was that 1/2" in diameter.

 

K20 2.5" is dotted 3" is solid.

 

N/A ? mildly built ? mods ?

 

Mild build no internals. http://www.k20a.org/forum/showthread...t=inch+exhaust

 

I'm pretty sure it has more to do with the quality of build and bends and flow than it does OD/ID.

 

And it sounds INCREDIBLE. Ask the 100 or so who saw me hitting the 7100 rpm limiter here at Lone Pine, lol.

 

But techinally he 2.5 catback to 3 inch , which would leave back pressure.

I was under impression that the OP wanted a 3 inch exhuast from the Y.

Also to the OP , the 6th gen is a Y pipe into 1 single pipe and back out 2 mufflers

There are a few people that are running True Dual Setup.

I am one of them

 

I guess, I found that after a 2 second google search. Its been done many times on them.

 

So this is a 98 Civic with ".......the only mods are an RBC intake manifold, 11" intake with velocity stack/filter combo, and long-tube Tri-Y header, tuned on K-Pro."

I guess some could consider that mild...I don't really. But anyway, I'm not saying there is nothing to be gained by 3inch exhaust, just that it probably should be accompanied by mods that really need that big of an opening.

Read all those pages in that thread, several of those posters are in disagreement about those gains with the 3in exhaust even after the dyno. There is a little more to it.


"If you eventually plan on doing headers and Y-pipe then I might think about 3in exhaust. If not stick with the 2.5..."

My 2cents

 

SSIM, Berk intake, OBX headers, and a technosquare ecu, similar to everything that honda was running. Its all bolt ons until you start adding internal work thats mild nothing fancy. NiZMo1o1 said No 4 banger could benifit from a 3" exhaust I showed one that did after a 2 sec search.lol As for some of the posters being in disagreement, meh people are in disagreement here even with a dyno proving the numbers can't please everybody...

At any rate, cattman has enough back orders for his 3" exhaust and people are going to be running them with a variety of setups so hopefully we'll have some more dynos of it this summer.

 

is the op wanting to run 3" into a single muffler or run 3" into a dual muffler setup? If he wants to do that, what size piping would he be needing after the split because he wouldn't want 3" right?

 

thankyou for the opinons on this..

 

Do u have pics or vid clips of this True Dual Setup?