downpipe and testpipe? wtf is thera diff?

i want to do a custom catback with this mufler i picked up from a shop the other day. the muffler sounds pretty deep. i want a lil more top end power.. im thinkin of gettin headers but rpw is so expensive. im thinkin some kamikazie. but how much power do these yeild.. i dunno how big to make th piping? and if the header is legal in california? i dunno someone help lol!!

 

down pipe is the start of the exhaust which leads to the test pipe (where you currently have a catalitic converter aka cat) then comes the catback setup. If you want to stay street legal you can't use the test pipe you need to either keep your stock cat or get a after market high flow cat.

 

street legal depending on where you live. Check with your local DEQ to find out what the laws are. The area I'm in they don't do any testing so I can run w/o a cat if I want

 

if u want more top end power than get headers, a high flow cat and cat back system.. u will lose low end tq but u will gain in top end. u wont really gain much hp but u will feel the difference. u should go for 2.25'" piping, i think that will be good for u. a nice intake system will help u with some power.

 

ok so the downpipe, does that come with the header? i know rpw does , but does kamikaze? so the downpipe to the testpipe or high flow cat to the axleback. (is that right)ok so right now i have one cat and then thats it, form there its just pipe. so if i get a custom catback, it eliminates the cat i still need a header with a downpipe and a testpipe to attain the ultimate setup right..? i have an auto i wanna some day attain the fastest auto lancer.(i kno its lame ) but hey im tryin to make the best of what i have.

 

Headers -> Downpipe -> Testpipe -> Catback.

 

If you have stock exhaust then right now you have 2 cats. One in the factory header and one beneath the car. If you replace the stock header then you will be removing one of the cats. That in itself will free up some restriction. WHat header you choose to do this is your decision as there had been a review of every type out there.

2.25 piping at this time seems to be the best compromise between loss of torq and highend hp gains.

It's all up to you what you want the end result to be.

As for the RPW header I am waiting until someone else from the board has a chance to drive my car. Everyone knows how I feel about them but maybe if someone else gives a testimonial it would be more believable. The thing with RPW is you need to jump in when they are having a group buy and this lowers the cost of shipping considerably(Australia). Even still it was worth the money for me.

Good luck.

WADAD

 

Terminology lesson:

A downpipe is actually a part on a turbo car.

The part we are referring to should correctly be called a dumppipe. But since Buschur (the only maker of aftermarket ones) called it a downpipe, we all seem to call it that. But whatever.

Get the RPW header/downpipe combo. It is expensive, yes. But it is worth it.
But if not, do the cheap way (like me) - RRM header, Buschur downpipe, either RRM test pipe or Buschur high flow cat converter, and then catback.

 

Downpipe and dumppipe are the same thing. They both go down from (or dump exhaust from) the exhaust manifold. Stock exhaust manifold, header (and everyone please remember we only have one header so it's not headerS), turbo manifold, whatever, the terminology doesn't change.

 

I stand corrected then.

 

in what order would u reccomend replacing these parts. between car payment and school I will be buying slowly piece by piece.

 

ok i am thinkin, heres my order of opperations.. nrg carbon fiber muffler, with 2 and 1/2 inch piping to get rid of the first cat... then (do i need a testpipe) i mean what diff will this make, what the hell does it do anyways? if i get a header with a dumppipe then wont i get rid of a cat? or will the cat still be there and thats why i need the test pipe.? please clear this up ? does buschr have a site.

 

ok, you have 2 cats, the first is built into the header and the second is under your car. unless you are going turbo, your best bet is to get a new header and downpipe followed by a high flow cat, and then finally cat back exhaust. Test pipes are ok with turbos but you will lose way to much back pressure if you put it on an N/A car. also, if you haven't you should do your intake work first because otherwise you will be suffering a low end performance hit with this exhaust.

-Justin

also, a cat is a device that filters the exhaust to make it clean...er... but at the same time is very restrictive, the engine has to work harder to push the exhaust through these things. By getting rid of the first cat and having a high flow cat where your second cat is you still maintain a bit of that pressure so that you can actually have some low end but is free flowing enough so that you benefit in the top end aswell.

 

Your catback piping won't get rid of either cat. A header removes the first cat that's located inside the stock manifold. A highflow cat (shameless plug: I have a 2.5" for sale!) or testpipe removes the second cat that's located between the stock downpipe and the catback piping.

And Buschur's website is buschurracing.com.

 

how much