Stueck

cant go to other forums....school computer blocks forums (except for this one! wooo)

Roddimus Prime

fitment problems?? I've seen Tophers first hand and he loves it....maybe an actual owner will post about it.

tom grossmann

Ok I may be the wet blanket here; Do not know what else you have done but simply bolting on an exhuast doesn't do a whole lot for the engine. Look in any tuning book it will recommend match intake , cams , exhaust etc.
Your buddies at Toyota & Mazda may not be there forever and with the advent of smog legal tuner parts most dealers take a very dim view of things like taking the cat off.
Plus there are systems that will offer the same power gains and still be legal. The other dilema is when you go to sell a car that won't pass smog.
Besides guys your age with modded cars get hassled way to much as it is , believe it or not some cops will look under the car...espcially tuner type cars.
I'd pass on the system get a good performance system that is legal or save up the bucks for a turbo kit.

My .02 of course , Tom

Roddimus Prime

the performance gain from this style header that removes both cats is actually pretty good. I've seen some people 15-20whp from it. You are right though for an all-out build cams, headwork and intake are critical. However, just adding this one piece will be a noticeable gain.

As far as emissions are concerned. I've never had to deal with them here in alabama but I have put on about 15-20 headers here in my driveway and it takes maybe 2 hours to swap everything back over....leave the MIL fix on the o2 sensor, swap the stock pieces back on and in 2 hours you're back to being modded. This sounds like a hassle but I've been told that most places don't even require inspections on newer cars until they are like 2-3 years old....after that it's only once every 2 years....i'm sure it's different in every state but 4 hours of my spare time every 2 years is worth it to me. I've wasted more time on the toilet after Oktoberfest.

goldstar

Why would anyone want to remove the O2 sensor as it serves an important function in the proper running of the engine. It reads the exhaust gas composition and sends the data to the PCM which in turn adjusts the injector pulse duration to maintain the stoichiometric A/F ratio during closed loop operation. The stoich provides best power and fuel economy and maintains the catalytic converter at maximum efficiciency for emission control in the closed loop mode. Substituting an MIL eliminator may keep the light off but since it can't "read" the exhaust gas it can't function to help maintain best A/F ratio.

Of course in open loop mode (WOT above a critical RPM), the PCM operates off pre-programmed maps and bypasses most sensor inputs including the O2. But unless your building a track car, I'd imagine that most of your driving is done in closed loop mode.

slowpro

Roddimus, how can i buy a MIL from you b/c I need one. Will it stop my car from running super rich?

Roddimus Prime

goldstar....the actual design of the MIL eliminator allows the second o2 sensor to see "ideal conditions" and therefore it adjusts accordingly. I've actually heard of people using them on stock cars with both cats and getting better gas mileage. Removing it alltogether doesn't make any sense, but tricking it into seeing what you want is what everyother piggyback controller does.

Slowpro, do you have a header that eliminated a cat and now you have a check engine light? If so the MIL fix WILL give you back your gas mileage. even without you may get a small gain (or so I've heard from other owners). If you need a MIL just send me a pm requesting one and as soon as my next batch gets in I'll set one aside for you.

tom grossmann

Wow I'm surprised at that big of a gain , I see why one would be tempted. Here in Clark County (Las Vegas) NV we have fairly strict smog laws. The rest of Nevada is so rural it doesn't even have a smog check. (Reno might not sure)


Tom

Roddimus Prime

i know from a standard 4-1 obx header that only removes one cat we've seen gains of 10+whp, people are claiming 5+whp off a catless midpipe also...the other thing is that a 4-2-1 header like the RM is a slightly better design for more power. I don't think it would be that far-fetched to get 15+whp from that header and midpipe. probably sound real good as well.

goldstar

I see your point Rod, thanks for clearing that up for me.

Stueck

that is another thing i am worried about....noise police.

Jackelope

i HAVE to get a new exhaust when i get a header b/c i have no muffler

Stueck

ah yes, you took the sazall to it? something like that?

TitaniumMSP

Stueck...not to sound like an advertising ***** but seriously if you are not worried about the exhaust system having a CAT on it you might want to consider the Cork Sport Power Series cause mine sounds extremly sweet and puts 12whp.....not to mention it is freakin cheaper than most out there...

Jackelope

no, mine was taken off, still have a tailpipe, i can't remember who did that, someone on here though.