I've been doing a lot of research on the proper diameter for a 3.2 with 10:1 compression and around 250-300hp.

Most info on the web is around the same, and as far as it says, to increase torque keep the pipe to a minimum and increase top end but loose torque, then you maximize the size. Plus the larger the pipe size, the louder it is.
I think we all know that, but a lot probably doesnt know minimum and maximum to go by.
This seems to break it down pretty simple without all the formulas:

 

2.5" main pipe that splits off into 2.25" is ideal imo.

 

x2

If boosted, go 3".

 

If you can find the piping I would go 2.75inch.

 

well, i have 2.5" main pipe, into a 2.5" dual out/crossflow muffler and it is waaaay loud and i have a lot of popping when letting go of the gas. a lot of people thinks it sounds cool, but i think it doesnt and thats what counts, plus by looking at this, im above the maximum size, which is really decreasing my torque.

im gonna try my single exhaust next, so i'll keep the straight 2.5" all the way to what ever muffler i choose....and i am gonna modify the back bumper so it looks wright...

yeah, you guys are correct on the 2.5 into dual 2.25, and if everyone wasnt doing that, i probably would. i know i dont always have to be different, but i have already got rid of the stock stuff, so i am gonna work my way back up...lol
Reese, i think 2.75" single would probably be perfect for my single exhaust idea, but i know you were not talking about that

thanks for the replies

 

I actually was talking about going 2.75inch single or even doing 2.75 inch then split off in to dual 2.25

 

2.75" or 70mm piping is exactly what ive been thinking for single exhaust..we'll see what i do

 

70mm is 2.75inchs. This will be what im gonna do to my exhaust next.

 

yeah 70mm is 2.75", thats what i was saying, and 63mm is 2.5".
i think you should go 2.75 man, may give you even more top end, not like you need it with your 286whp...lol

vids will be up tomorrow of my loud, popping exhaust...lol

 

This is why I took off the RT cat.

2.5 is plenty for most cars.

 

Stock exhaust + cut out and you have best of both world + sneaky & no police eye balling u Can take your grandma to the market
http://s1119.photobucket.com/albums/...t=a263b59b.jpg

http://s1119.photobucket.com/albums/...t=fd6b9709.jpg

 

cut out?
please explain?
like the vettes?

 

google it. It's a cut out that opens at higher RPMs for unrestricted exhaust. Yes i think the vettes have it.

 

http://www.quicktimeperformance.com/QTEC/index.php

 

Don't know what vett your talking about but they do use them. I basically got tired of looking for an exhaust that only adds 1-5hp and drawing cops attention so I did a little research on it I found out it's like running open header & @ the flip of a switch u can close or open it + it's best for boosted cars s/c or turbo so istead of waisting $650 on comptech that has the same size piping as our stock exhaust 2"1/4 . I had 3 different exhaust setup & I must say I have been waisting $ this Is the best so far and cheapest it revs way faster in all gears I would make video but my trans is busted . I can't wait to boost this thing it should be ridiculous . Warning it's louder than your avrage Mustang or vett with straight pipe

 

well, thats cool
wait till i have my vids up tonight, my car is stupid loud, thats why im changing it again...

 

not the greatest vids, but you kinda get the point. not really getting on it 100% in either video, and it wasnt popping as much as it usually does of course...
#1 interior with window down
http://s1185.photobucket.com/albums/...TERIORREVS.mp4

#2
outside rolling shot in 1st gear. dont mind the writing on the window from the track last week, havent washed my car yet..lol
http://s1185.photobucket.com/albums/...OLLINGREVS.mp4

 

yes it does say 93 degrees on the gauge at flippin 6:45pm..lol

 

That's crazy my best advice is to put a high flow resonator on there I have 1 if u want ? It

 

im gonna take off this setup probably this weekend, ive just had enough.
gonna try single 2.5 or 2.75 and see how that goes, but i still may need that resonator..lol

 

This pic was taken during the mockup stages but i ran twin 2 1/4.

 

looks like a cool setup, and within perfect hp/trq balance for our cars too with the pipe size.
hows it sound?

 

No prob just pm me address or where u want it shipped

 

apparently, my car isnt the only one that sounds like this...lol..

 

hopefully getting my exhaust replaced to a single outlet, and will be posting new vids

 

good job man

 

thanks a lot, i thought it was informative, but nobody else other than you has really thought so...lol, oh well..

single spoon or greddy evo ii on in about a week, then new vids...

 

i was gonna do a single spoon muffler, but this Greddy Evo2 sounds great, so i may just do that even though it doesnt look as good as the itb spoon muffler..
http://www.youtube.com/embed/yhjcY8C7ysk

 

I still really like the way this sounds/looks:
Accord V6 w/ 3" HKS Carbon-Ti

 

Try. Your stock muffler with the cutout you won't be disappointed

 

Being different just to be different is kind of silly. A single 2.5" to 3" would be best for weight savings and power, but this is an acura and the bumper has 2 cutouts. The only car that should really do a single exhaust is a track specific car that competes in autocrosses and time attack etc. that is also completely gutted etc. This is just my opinion tho.

 

^ This is why I'm getting a new rear lip with a single sided cut out.

 

i agree with you, and that was my first choice like i had said on another post, but since i saw you were going to do that, i decided on either the Greddy evo2 or a Spoon Itb N1. The spoon looks cooler, but only sound clip i found was on a fit and s2k.

i was told only turbo applications use 3" by numerous guys, and power would be lost if you ran that on an Na car with 300hp. Now if we had 4-500 hp NA, then 3-3.5" would be good for single.

I think the 2.75" you were wanting to do will be good, im only doing 2.5", but i have no mid-muffler, and plus i plan on a h.f.c. and 2.5" collector on my header in the future...
gl

 

I'll be running a 2.5" fast cat but it will open up to the 2-3/4" cat back. I have only been able to find the Carbon-Ti in a 75MM rather than the 60mm, which is another reason why I'm going with the 2-3/4" rather than 2-1/2". I won't be running a mid muffler/resonator unless the exhaust is just too loud, which I'm hoping it won't be... Unfortunately, this won't actually be installed for a couple months. I need to get my suspension in yet as well as some other misc items plus I have a trip to California to be planning for & a surgery on my dog. So, funds are tight right now.

 

I HEAR YA MAN..
I have plenty of little things I want or need done to the car, and keep coming across great deals, but cant purchase because of bills and such too...but gl on your set-up, should be great...
63mm is 2.5" btw, and 70mm is 2.75", 75mm is 3", so that may or may not change the sound if your inlet is 3" rather than 2 1/2"
guess ill have mine up this weekend or next, so i'll post up new vids..im sure it will sound better than the ones i did a few posts up^^^

 

Well, this is the new dilemma... Since the HKS Carbon-Ti only runs a 75MM & the HiPower is 60MM (2.36") should I run all 2.5 or 2.75 and expand the piping to the 75MM muffler or run 2.5" piping and compress down to the 60MM. I feel like the best results would come from 2.75" and expand to 75MM, but the header's collector is only 2.5 & the test pipe will only be 2.5".....

edit:
eh, screw it... 2.75" w/ the 75MM and hope for the best...

 

let me get mine done next week, and i'll let ya know. And like i told you, im doing 2.5" everything..

As far as what you wanna do, i would do 2.5" and still use the 2.75" muffler.
Def. wouldnt go smaller than 2.5" on a single exhaust...

 

the 75MM is actually 2.95" so it's only 0.2" expansion of piping from the 2.75"

 

sorry, i was thinking 70mm the whole time, i appologize..

Anyways, was on , and a lot of the accord guys, 6th, 7th and 8th are running 3" single with evo2 or apexi n1, and they are all using a 18"-30" resonator...so, i dont think i will need one with the 2.5" and torque wont be lost....we'll see

the info i posted in the opening still seems to be true as far as size of pipe for size of displacement and hp...gl man

 

GL to you too.