high flow cats or none...

Toby

Any HP advantages with pipes over high flow?

Not concerned with all the other factors...just HP difference...if any.

Thanks.

Viperjohn

5 to 10 HP difference. May be higher depending on engine modifications.

Josh M

Well if you have a high hp application, say some crazy twin turbo setup. The freer flowing exhaust with no restrictions the more performance advtanges there are

hostile

well, all I know is, I removed the cats and I am getting upwards of 75 horse from that single modification.
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OK, perhaps not. But I did feel a bit of a difference without the cats as well as the fact that I do not burn the crap out of my leg.

GTS Dean

If you pull the cats completely, you'd better run mufflers or you won't be able to hear anymore.

hostile

What?

twinturbo3150

huh

DynoDaddy

0 cats = more Powwah

Toby

and cheaper to do.

high flow cats = 350.00+

no cats = cost of pipe and +-140.00 for O2 sims.


Thanks for the info guys.

no cats it is.

twinturbo3150

I sure wish I could get rid of my cats all together but I have stupid emissions here in utah.

twinturbo3150

Is there a way to fool the emissions machine if I did get rid of my cats and just went straight pipe with high flow mufflers.

hostile

I removed the cats and then when emissions rolls around, put them back on. I had to weld a lip back onto the cats, because you have to literally cut them out. But after that, it only takes about 20 to 30 minutes to swap them out.

99 RT/10

I think the Mopar ECU would fool the emissions machine. Ask JD, I think he did this with his car.

twinturbo3150

Hostile, when do you emissions test once a year or once every 2 years. For me its once every year, So Im comtiplateing whether it's worth doing what your doing or not. Maybe slip the emissions guy a few extra Jacksons for his troubles.

Jerome

Without cats the NOX will read high, no way around that. Easy way to tell if the cat is, gutted, bad, too small, missing, etc.

hostile

Ahh, yes. I do emmissions once every 2 years. Could be a pain if you have to do it every year. You may just want to go with some nice high flow cats.

Otherwise, those teenage kids at the emmissions center do not make much dough, so a few jacksons or even a benjamin might do the job.

MNTNGTS99

Here in Idaho we do emissions test once a year. They plug into the OBDII port. Scan for codes,short and long term fuel adaptives, ect. Mine has passed two years now. ROE S/C ,Water/Meth,no cats and no sims. 99 GTS.

hostile

Actually, that reminds me. I was speaking with my mechanic and he said that plenty of viper owners get emissions done without cats. He said that they get alchohol from the raceway and mix that into the fuel to burn cleaner.

Apparently he even does it with his turbo'ed T/A. And I think that I am going to give that a whirl this year. You can get one retest up to 30 days later if you do not pass the first time.

twinturbo3150

here in utah, they dont plug into the OBDII port, they do how ever stick a prob up the tailpipe and run the test that way. If Utah did the testing like Idaho I would be in fat city. Or even if Utah did it every 2 years I would do what Hostile does and remove my cats, then when testing comes around put them back on.

twinturbo3150

I will have to try the alcohol, utal also has a retest 30 days to fix problems. thanks Hostile