option on ebay headers and catbacks

[koollude]

just to add my 2 bits... 3" tubing is LOUD!!!!!!!!!!!!!!

[2000h22a]

Originally Posted by Lude_lover

THIS^^


3" has proven gains on a NA lude. Is it worth the price vs 2.5? probably not

usually its not much of a difference, I made my full 3'' system on my last prelude for just over $500, that was the custom DC header, 2.5-3'' testpipe, 2 12'' flowmaster resonators the Kteller 3'' piping kit and a vibrant muffler.

Originally Posted by vansprinkle

back pressure is bad. you do not want back pressure. you want velocity, enough so your exhaust basically creates a vacuum.

billy runs a 3" on his mildly modified NA engine (stock cams, stockish bore, stock stroke, stockish compression, etc). I believe David has a 3" as well with the same lack of mods and my car will also be getting the 3" treatment with few mods.

Edit: I should note that Billy's, David's, and my car are not street driven, so the fact that a 3" is fine for us, does not mean it is fine for you (also, our cars have H22s, so if we are talking F22 or H23, the size will need to come down).

I thought I would do a quick search to find you guys a little relevant info on exhaust velocity. I think this little article does a pretty good job explaining it, even if they are referring to Miatas. http://www.miata.net/garage/KnowYourCar/S4_Back.html

yeah that was the exact link i was about to post up, mine was a mildly modified street driven DD
Here is the 3'' setup on a n/a h22 with basic mods, basically the same exhaust that I had, just different resonators and testpipe
http://preludepower.com/forums/showthread.php?t=283663

Originally Posted by koollude

just to add my 2 bits... 3" tubing is LOUD!!!!!!!!!!!!!!

do you have proof that it is or are you just assuming?

[Kronis]

From what I have read, backpressure is bad in any FI application. But if you run the biggest exhaust on N/A to cut out all backpressure, you lose Tq along with sucking cold air and burn the valves.

Regardless, the changes are minute and not very noticeable. Too big on an exhaust, the exhaust flow is slow and cools down. To small, it's restricting. There is no "best exhaust" as you have to take into accounts bends and even dents if there are any, if you want to get that specific.

[sean1121]

Originally Posted by Kronis

From what I have read, backpressure is bad in any FI application. But if you run the biggest exhaust on N/A to cut out all backpressure, you lose Tq.

Define back pressure.

From: http://en.wikipedia.org/wiki/Backpressure

Back pressure usually refers to the pressure exerted on a moving fluid by obstructions or tight bends in the confinement vessel along which it is moving, such as piping or air vents, against its direction of flow. For example, an automotive exhaust muffler with a particularly high number of twists, bends, turns and right angles could be described as having particularly high back pressure [1]. Back pressure, in the exhaust sense of the term, of a four-stroke engine is usually termed as being a "bad thing" for performance; however, in the interest of reducing exhaust sound to levels allowable by public noise ordinances, back pressure can be regulated using systems from simple butterfly valves to fully computer controlled units sensing pressure in the exhaust pipe itself.

In a two-stroke engine however, a certain amount of exhaust backpressure is needed to prevent unburned fuel/air mixture passing right through the cylinders into the exhaust.

Emphasis mine.

Originally Posted by Kronis

Torque does matter, whether people refuse to believe it or not.

Thank you captain obvious.

[DJMonkey]

I picked up a skunk 2 catback into a vibrant exhust and it's on the car now.
what would be a good 2.5 header w/ matched downpipe.
also what would be a good high flow cat?

[jmay]

the tri y you can get them on ebay now for like 350 it has a 2.5 inch collector so it will be perfect!!! oh wait u have a f22 right?
not alot of options there I would get a dc if that is the case
bisimoto if u got the $$ but they are expensive but the best money can buy 1000$$$ but y buy that y dont u just drop a h22a in and call it a day!!!

[jdmh22]

back to the OP what header are you going to get now?, i saw micheal got a triy, that thing look nice and solid in someway , i think he got it on pp for 300 shipped, i might pick this one up but i still want to see if he had to knotch his crossmember or not

[Knight511]

Ebay header suck much ass.

Just an update.

[DJMonkey]

@jdm im not sure what header to get, i trying to find one for the f22, the one michael has is for the h22.

@knight yea they do...

[jdmh22]

dude go for weapon r it like 160 and had limitied lifetime warranty, that should beat the warranty of any headers out there

[2000h22a]

Originally Posted by jdmh22

dude go for weapon r it like 160 and had limitied lifetime warranty, that should beat the warranty of any headers out there

thats a joke right?

[vansprinkle]

GBOGH!!!

I'd look around, you can probably find a good quality used header for around the same price (maybe a little more) as a crap eBay header. Remember, keeping your long term goals in mind is always a good thing to do.

[Knight511]

Originally Posted by vansprinkle

Remember, keeping your long term goals in mind is always a good thing to do.

You know... like getting rid of that broke ass old car?