High-Flow Cat on Turbo Setup Question...

[sauccarl]

Ok so from what people tell me, I should upgrade the whole exhaust system to bigger piping when installing a turbo kit right? Well, wouldn't it be cheaper and have the same effect if I just replace the catalytic converter with a straight pipe and just put the original catalytic converter back on when I have to go do emissions?

[ComputerJLT]

turbo + stock exhaust = bad

don't even consider it. ditching the cat should be a given and with a good tune you can pass emissions w/o a cat unless something is wrong.
One of my tunes has at least :p

[sirtef9]

No emmisions needed here anymore....:drink:

[boostedEG]

i turbo'd a D15b7 with a 14b at 8psi.

the ass dyno felt no difference between open downpipe and full stock exhaust w/ stock cat. you have a D16z6 w/ 14b right? i would expect similar results, so i say you should be ok, for now atleast. i think the stock exhaust on the eclipse that your turbo came off of is the same size as your stock exhaust (if you have an D16z6)

if it was a T3/T4 on higher boost or something that would be a different story.

[fantasya98]

even with a straight pipe you're still using your stock exhaust system which blows. I say upgrade your whole system and get a high flow cat...

[HONDA GHANDI]

You cant pass emissions in Denver without a cat. They physically check to see if its there. If you have something that resembles a cat (but isnt) and have a clean tailpipe reading they will pass you. I personally dont see the issue of going without it. You can tune the car correctly, make the best power and still pass emissions all without deleting the cat if the exhaust system is built right. If you are going to pay to have an exhasut made you may as well build it right the first time and not have to crawl under the car every year to switch out a test pipe. I have two customers pushing over 400whp each with high flow 3 inch race cats, cars both pass emissions with no problems and no adjustments needed to go test.

[velocity]

do whatever tobi says lol

[boostedEG]

If you are going to pay to have an exhasut made you may as well build it right the first time and not have to crawl under the car every year to switch out a test pipe.

+1

[HONDA GHANDI]

do whatever tobi says lol

Nice avatar. :D

[Spooled50trim]

even with a straight pipe you're still using your stock exhaust system which blows. I say upgrade your whole system and get a high flow cat...
:werd:

[fusionsport]

Just a sidenote- DO NOT use a ceramic core high-flow cat on a boosted car if you can help it. The richer mixtures turbo cars run can and will quickly destroy a ceramic core cat. Use a mettalic core element cat. It isnt too terribly more expensive but will be miles ahead of the ceramic core in terms of service.

Also on boosted engines on the street I wouldnt get too caught up in cell count. On a road race engine where you HAVE to have a cat for the rules it is worthwhile to spend the $$ on one of those super-pricey cats, but otherwise I wouldnt worry about it.

[boostedEG]

^^^ how do you know if its ceramic or metallic?

i work at a place that carries a lot of exhaust stuff, and most the cats in our catalogs dont say whether its ceramic or metallic. all they say is 2-way or 3-way which brings up another question... i know what 2-way and 3-way means, but does it make that big of a difference which one you use?

[fusionsport]

The Ceramic core are typically the traditional semi-oval shape and the metallics are usually the round ones. I have the Magnaflow part #'s around somewhere. If a cat description doesnt specifically say its metallic I would simply assume ceramic.

[Civic-8442-]

thats interesting i didnt know that^^

[TEGGY-1234-]

me neither