Hey, I have heard alot about test pipes and from what i've come to relize that all they are are just hollowed out cats., right?

How does everyone feel about them?

What are some ups and downs about going this route?

It's something that I was thinking about doing, but am not quite sure about it.

How much actual hp does this free up? And is there a big hp difference between a test pipe and a high flow cat?

Thanks alot guys/girls!

 

https://honda-tech.com/zerothread?id=331702

 

Why pollute, have your exhuast stink, and sound more raspy for an extra 1-2hp over a good high flow cat?

 

test pipe for street car =
test pipe for race car =

 

Well, ok what about this.. If you ran say your cat(for those w/ obd2) and used an output pipe say to your axle or near it w/ a universal muffler? how about that? would it free up any power/ or sound bad???

 

negative.

 

exactly

 

Cats are gay. I ran a hollowed cat and then a testpipe, and the test pipe definately gives you more top end. Get a testpipe from http://www.testpipes.com and you will love it.


[Modified by EvoAccord, 7:51 PM 12/5/2002]

 

it always stinks its exhuast gas i dont ever think theres a point where i had a heavenly smell to it....and i got more than 2hp from a TP/ HI flo

 

My test pipe was like 30$ shipped. Quality piece from http://www.testpipes.com. Perfect fit. Noticable gain in the upper band and a nice tone w/ my Greddy Evolution. Was it worth it ?? A definite yes. Would I do it again ?? Hell yeah. Does it stink ?? Not unless you stick your face in the can!

High flow cats are generally expensive and can range anywhere from 150$-250$ depending on manufacturer.

You'll be dead before anything happens to the ozone.

 

Ozone destruction is the least of what you'll do. How bout increasing incidents of cancer, acid rain, heavy metals in fish stocks...the list goes on and on from emmisions of reactive uncracked hydrocarbons, nitric oxides, carbon monoxides and all the other crap that is in there. That a smog check only looks at three things doesn't mean there ain't anything else "in there" that can hurt you. You think nicotine and tar are the ONLY reactive substance in cigarettes? All that **** goes somewhere >air>ground>groundwater>crops>anima lfeed>animals>you.

"Straight-pipe" is an unwise choice if your not racing.

>If you can afford it, go with the high-flow cat. If you can't, just chill. Nobody needs anymore pollution than they've already got. Save a buck or two and help save the place you live in.

 

I never once smelled a stink out of my exhaust. What does this stink smell like?

 

Rx7 Stink? Or old-car stink? It's really different ya know - It's a different kind of smell...

rx7 = Gas stinky, kinda sweet smelling
old-american-car = noxious, stomach churning *STINK* (burning oil/gas/coolant)
straight-piped jap car = more of a caustic, burning eyes stink. Not stinky, just more reactive stink.



[Modified by RotaryBzzz, 4:18 PM 12/5/2002]

 

nice man

 

Well damn,now I fell like an ******* for just thinking of the idea. I never said I was definitely going to do it, but just thinking about it.

Thanks for the info though.

 

I got a test pipe that I can slang to yall, went stock cat, sounds nice with the trust. Was used for about 4 miles still brand new came from testpipe.com. Lmk if yall interested.

 

is this english? you need to be more clear in your posts

and like I said before and Rotarybzz backed me up you do not need a test pipe unless you are a race car driver, which none of you are

 

I just did a search using the words "test pipe" and got 165 results...This thread is like watching TBS or USA on a weekend afternoon...

 

I think he was quoting a Nate Dogg and Warren G song.

 

Maybe im insensitive to the environment. But the perecentage of cat-less cars running around is such an insignificant part of the problem of air pollution. If you eliminated all the cars running out cat-less i am willing to bet the impact of the environment would be basically, nothing. Think about the ratio of cars with working catalytic converters to those who dont have them.

Nick- who likes to play the devil's advocate

 

Well...them I'm the OTHER devils advocate

If you want to read this, it's a whole explanation of automotive emmisions. Rather long. Scroll down to Table 3.3 and you'll see figures for uncatalyzed vs. catalyzed cars. I believe these were European Union typified fuel efficient engines (1.3-1.5L) so take that into consideration vs. our USDM typical 1.8-5.0 Liter engines. I.e. these are high-efficiency, gas sipping cars due to gas prices of ~$5 dollars a gallon. One tax in London at the dealer is by the volume of emmisions your car emits if you can believe that.

http://www.geocities.com/davefergus/...ion/3CHAP3.htm

Here are some highlights from that series of studies...

Table 3.3 Emission Rates of Motor Vehicles in City and Rural Driving
(grams per vehicle-kilometre driven)
---------------------------Urban Driving---- Rural Driving
Vehicle, Fuel - Type - NOx - HC - SO2 - NOx - HC - SO2
Car, gas, no cat, 2.5, 6.1, 0.0, 2.5, 2.9, 0.0
Car, gas, cataly, 0.7, 0.4, 0.0, 0.4, 0.2, 0.0

As you can see, there is a large difference in emmisions. At least ~250% to ~1300% more in no catalytic convertor conditions. And again, these were European smaller-bore cars. Think of a straight-piped 5.0 mustang and dang....



[Modified by RotaryBzzz, 12:02 PM 12/6/2002]

 

industrial pollution is also shitty....or is it..

chitty?

CHITTY WOK!!

come hea fo yo chitty chicken and chitty rice!!

 

I know know much about the effects on ozone and all that good stuff.
I have a high flow cat, it smell like sh_t, kinda like plastic, wood and
gas burning together.
I took the high flow cat off after i added my header, it got so damn loud.
as far as performance goes it's bang for the bucks.
but i cant stand driving one everyday just for the 1hp at top end.
Maybe is nice to have one for the track and stripes.

 

All of this is still WAAAYYYYYY less than your average city bus, which is emissions exempt.

 

I agree. But how many buses are there on the road vs. cars?

I'm not sure about other places, but at least here in LA, 95% of the public bus fleet is now compressed natural gas powered (CNG) with emmisions at a fraciton of what diesal's are. Actually, toyota (or is it someone else?) has been developing diesal catalysts for trucks and buses so we'll probably see good reductions in emmisions coming from them too as they cycle in.