I am one a very limited budget, and planned on leaving my exhaust stock and just working on suspension. Come to find out the exhaust mani is welded to the cat by a long pipe, the problem is that it pipe is much smaller than the rest of the exhaust. So small they just slid it into the stock pipes and welded it up. I am assuming this is a big choke point for the exhaust. My Idea is to buy a used header, 2 or 2.25 inch col. and weld up a cutout right after it. What do you guys think about this. All it would cost me is the price of the header($100), cable cutout($47), and welding. Should I stick to a smaller size so there is still some back pressure? The engine has no mods other than a SRI.
I know this isnt going to sound the best, but I will still have the stock exhaust + my itr muffler when I dont want it to be loud. I guess its just appealing to me to be able to have the option of haveing really quiet and then really loud exhaust.



What I want to do is get a new header followed by a cutout most likely this one. Opened by a cable. I want to go with this because it is cheaper, and I dont mind doing it manually. One of my main questions about this is will it leak alot? A small amount of leaking is ok, just wondering if anyone has had experience with this one.



I have also thought about just buying a electric one and making the y-pipe. It would require more fab, money, and time. I would not be able to do it myself since i have no welding skills. It would look something like this:



Thanks in advance for any input.

 

Nobody has any input?

 

I probably wouldnt bother with a thing like that. Besides if your car has two O2 sensors one before and aft of the cat, the fact that exhaust exits before the cat might cause your car not to run properly.

 

I'd say that is pretty pointless on a stock car. If it was forced induction, it would be different. Also, if you are going to do it, I'd recommend something like a Flow-tech brand cutout. You have to actually remove the blockoff plate to use it, but the cable on/off valves typically do not seal very well.

 

backpressure is generally bad for a performance minded multi-cylinder, 4-stroke engine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegG2 &raquo;</TD></TR><TR><TD CLASS="quote">
I have also thought about just buying a electric one and making the y-pipe. It would require more fab, money, and time. I would not be able to do it myself since i have no welding skills. It would look something like this:



Thanks in advance for any input. </TD></TR></TABLE>

Why would the electric cut-out require more fab/money/time? Either one you get, you will have to weld it to your exhaust piping. The only thing on the electric ones that you have to take into consideration on placement, is the motorized part that sticks out like 1.5"-2" or so. But all the wiring is done already, just have to do pos/ground.

But for a basically stock NA car, i wouldn't put one of those on. You could possibly lose power rather then gaining it.

 

What cad program do you use?

 

Here is a lil setup we just finished....

 

Hmm, interesting.... lol



As far as my opinion on them, they are pretty unreliable. The one above lasted about 6 hours and then the motor fell off. Apparently it's a pretty common problem with the qtc cutout. They also change the ve of the motor quite a bit and unless you run 2 different maps, it'll run bad one way and good the other way. I'd do a full big exhaust and be done with it, it'll run good all the time and not be too loud.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">They also change the ve of the motor quite a bit and unless you run 2 different maps, it'll run bad one way and good the other way. I'd do a full big exhaust and be done with it, it'll run good all the time and not be too loud.</TD></TR></TABLE>

They work just peachy on MAF cars though.

We had the plate fall out of one of the QTP cutouts we used.

 

Ok thanks for the feedback guys. The only real reason I was going to do this is because I want to get rid of the stupid small pipe the muffler shop put on(before I bought the car) and had to replace the factory downpipe and was just going to put this on while I was at it. I dont have the money for a complete exhaust, and do not want anything really louder than stock all the time. I guess I will just replace that small pipe and be done with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by backpurge &raquo;</TD></TR><TR><TD CLASS="quote">They work just peachy on MAF cars though.

We had the plate fall out of one of the QTP cutouts we used. </TD></TR></TABLE>

would one of these work well on lets say a talon tsi?

 

i've had a QTEC cutout on my coupe for about three years now.the plate has fallen off three times(Loctite is useless because of the heat.ended up tacking the screws once tightened),the motor has loosened up a couple times(Loctite works decent for that)and the coupler is slowly stripping out and getting sloppier all the time(due to the plate hitting the stops,but the motor still trying to turn every time you open or close it).it doesn't seal well,and slowly backs off as you drive when closed.
i can deal with it since this is a weekend driver/race car.on a daily driver it would make me nuts.i'm trying to find some kind of "sliding door" style cutout,as all of the butterfly style cutouts seem to have these problems.
as said,it does make a huge difference in the tune needed for the car.my car was tuned with it open since it'll be open when i want power,but it runs pretty rich when closed for around town driving.
if you do get one,i'm take it apart first and Loctite everything,and tack on the butterfly mounting screws.
i've also used these on a few other exhausts i've made for people.they're experiencing the same problems i am.
chris

 

Let me guess we copied somebody right?

 

I was thinking more like great minds think alike.

 

Right Mr Tony....I know exactly how you think of us....Anyways have a good day..


-anthony

 

Wow, Mr. Uptight. Sounded to me like Tony1 was joking.

 

peakboost got a lil butt hurt? Damn It Tony, why you gotta go do dat right there for, poor young boy dun nothin but tryin to earn a descent dollar round these parts here

 

Lol im not butt hurt about anything.... I know he's the bullshit police.... ....Ive never even met tony or talked to him so i cant say anything about him....Anyways we havent used our qtec yet hopefully it works ok and doesnt fail like tony was saying....


Modified by PeakBOOST at 8:49 PM 6/24/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PeakBOOST &raquo;</TD></TR><TR><TD CLASS="quote">Lol im not butt hurt about anything.... I know he's the bullshit police.... ....Ive never even met tony or talked to him so i cant say anything about him....Anyways we havent used our qtec yet hopefully it works ok and doesnt fail like tony was saying....
</TD></TR></TABLE>

Oh it's going to fail... It would probably last through a few dyno sessions and that's probably it. After that, you'd realized you've spent more time trying to repair the damn thing than the time it takes to do a full exhaust I gotta say I've seen more than 10 of these E-cuts fail, and all the brands available out there. It's something about our buzzy hondas and crazy hot exhaust gases...lol They seem to run great on most mild V8's.

 

just run open downpipe... its not that loud

 

I know I've got nothing on your guys' setups comparably, and I'm not the first person to do this by a long shot, but here's mine. Already been to the track with it, it's fine. I used a DX DPFI throttle cable for actuation and a bracket to hold it open as a temp thing while I tested it. It's an LS1 throttlebody, something like 2.9" diameter.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shortyz21 &raquo;</TD></TR><TR><TD CLASS="quote">just run open downpipe... its not that loud</TD></TR></TABLE>

I agree... and it's sooo much easier too!

Incase you can't see, we dumped it at the end of the shift linkage (and it doesn't even have to go back that far, 'cause ****, race gas doesn't smell bad).


P.S. - I say screw E-cutouts. Just buy like 10 HKS 60mil gates or 15 Turbonetics Newgens, place them down the exhaust, then open them with CO2.

 

i agree too for the clean motor