2.7 mods?

So i figured my exhaust was holding my truck up but then i cleaned the airflow sensor and it helped alot. now im looking for mods to do to get the most out of my lil 2.7. if anybody out ther has one or knows any tricks just let me know

 

New headers and exhaust are the usual suspects for the 4 banger.

 

yeah intake go with K&N drop in filter..you lose hp with the full kit...deckplate mod...and then exhuast...pacesetter makes a header for good price...then have a shop build the rest...I'm saving up cash to have mine bent up using thrush welded muffler with dual outlets dual 2.25" tail pipes...also I just got the supercharger manifold for my truck so I should be supercharged within the month ( alpine supercharger...avail through LCengineering)

 

I have been looking at headers for my 2.7, but the suppliers all seem to indicate the headers are for 2wd only. I saw Pacesetter indicates 2 or 4wd, but they still don't provide enough info to know whether the headers will fit without modification and whether they fit with single or dual cats. Anybody know whether the headers show any real perf and mileage improvement over stock, which already appears to be a pretty decently engineered manifold?

 

yeah i can tell ya it seems like the header picked up a bit on the low end...as for dual cat....dunno...I installed one one my 97..on my ex's 99 and they both saw an improvment in tq but no real gains in MPG...also I ported the intake and exhaust on my one taco and picked up 15hp and 12TQdid it all with head attached to motor...just minor porting (gasket match) and polished it all up good....ofcourse put rags in intake/exhaust before doing this and pull them out after...maybe use shop vac a bit to be sure

 

Picking up 15 horses on a 2.7 is definitely significant. Although I would really like to pick up the 50 horses AFE advertised for their cold-air intake system for the 2.7. I'm still waiting for that to kick in (I know...they had the ad mixed up, but wouldn't that be nice?).

 

You are NOT going to get 50 HP from a CAI, it has to be a misprint. The only proven way to get that much HP is from a turbo or a supercharger.

edit: sorry, saw that you were just being sarcastic. Ummmmmm, nevermind......

 

Those looking for headers (or anything else) may want to check out Northwest Off-Road. They specialize in Toyos
http://www.northwestoffroad.com/index.html

 

Looks like a great site. Wish they listed prices on the site, though. I hate having to call just to compare prices. Anybody know whether their headers for the 2.7 will fit 4wd trucks?

 

i know the pace setter ones I got from ebay and they worked fine...even come witht he piece to connect to you stock exhaust

 

could you still use the stock cats? I have two cats on my system and need to make sure I am legal, so I can still pass inspections

 

Yes, the headers from NWOR will work with the 2.7/4wd and the price quoted to me was $489.95. You really have two CATs or are they a CAT and a resonator? Are you replacing the whole system or just the headers? I am doing the whole system and have been have trouble finding flanged/bolt-on parts post CAT (i.e. resonator and muffler) that are high-flow. I've checked out Gibson, Dynomax, Flowmaster etc. If you decide to call NWOR ask for John he runs the show over there and is a tech. He's been doing this for 30 years. If he can't supply you he should be able to point you in the right direction. Also, he offers the high-flow CAT. It is fabed by Random Technologies. I called them and you can buy direct. NOWR=$277 Random=$199.47. If anyone know's of any resonantors (or "bullet" mufflers that can function as a res.) and mufflers that are flanged/bolt-on compatable with the 2.7/4wd that would be great. John at NWOR recommended Walker Dynoflow (Dynomax), but their site does not specify if they are flanged and compatible, and I have struggled to find a local dealer who can answer my question.

 

Hey Tony, did you check out LC Engineering recommended by 350TacoZilla?
If not you should... and yes prices are listed. Good luck!

 

Thanks, to both of you. And, yes, my truck actually has two cats. I was told that makes my truck a Low Emissions Vehicle (LEV) model. I haven't figured out yet if that is the same as the California model, since I am all the way over in Pennsylvania, or what other changes that might involve in the engine or other systems. The '00 Taco comes either with a single cat or two in-line. Mine just happens to have two, and I know it is against the law to alter any emissions equipment that came from the manufacturer. I wouldn't be so concerned about it, except that I have to pass an inspection every year. I am pretty sure headers are ok, as long as they have the proper ports for the emissions sensors, and if they don't change the cat configuration.

I did check out LC engineering once, but as I recall, what they showed in their ad was the same header that other suppliers show as fitting 2wd only. Before I decide to by a set, I'll make sure I call and get a tech to give me the final word as to whether it will fit a 4wd model with two cats.

Rider, I bought the Magnaflow cat-back system. It's stainless steel and connects up to the stock system flange aft of the rear cat. Bolts right up, but they don't supply the bolts or gaskets. 7/16 X 1 1/2" with flat and lock washers works well. The system has 2 1/4" tubes and a free-flow muffler, and a nice polished tip. It's a bit loud for my taste, but has a nice sound.

 

i believe as long as you exhaust consists of pipe a cat muffler and the o2 sensors your fine... you can usually replace 2 cats with one and no one would be the wiser except you and your right foot... they are very restrictive.. the front one should have a sensor before it and a sensor after...the rear one is dead weight the computer doesnt even know about

 

I checked LC Engineering again and it wasn't that the headers weren't for 4wd models, it was that they don't fit 4wd with dual cats. So, I have to find out whether I can get away with one cat and what else that may change, as far as sensors and the computer. I also need to go through at least one inspection before I change anything, because if they check the VIN, it will tell them whether my pickup is a model that should have dual cats. If they are thorough enough to check that I could get a big citation. I'm not sure what they do here in PA, yet. I have been told they are pretty sticky about things.

 

Yes I have the two CATs as well on my 00 2.7l/4cl Reg. cab. One o2 sensor is before the 1st CAT and the second is aft. the 2nd CAT. I would prefer to dump it myself but being in an emissions state (Mass.) that will be a problem. I spoke to NWOR yesterday the headers they sell DO NOT match up with the Random Tech. CAT they sell. Ooops... They recommended adding the headers and simply replace the stock exhaust as needed. I want as much torque and hp out of this puppy as possible, yet any "high-flow" mufflers I have seen are all cat-backs and I don't want all that noise. Good to know that the Magnaflow muff. bolts on to the stock. Thanks Tony. Most sites have not specified on this, which makes me wary of making a purchase. Is there a high-flow muff., compatible with stock flange, that is not a cat-back? As of now I will probably just put in the NWOR headers and replace that stock muff. just to get the beast back on the road.

 

Well, there's the proverbial "rub". The Magnaflow system is a stainless steel "cat-back" system, which bolts up to the flange aft of the rear catalytic converter. The stock system has a "y" pipe that drops down from the stock exhaust manifold to the front cat. Then there's a section that has both cats on it, that comes from the Y pipe to the "cat-back system. it's about 40" or so long, I think. The headers appear to do away with the Y pipe and drop right down to the section that holds the cats. I'm not sure why the headers wouldn't bolt up to the front flange on that piece, as I think it's the same length as the cat section on the single cat system. I'm going to check this out with a dealer. I'll post what I find out.

 

the pace setter one does bolt up to the stock 2 bolt flange at the front of the cat.... the header itself comes down into a 3" standard header flange...then they send a 4-5" long pipe that goes from t he 3 bolt flange to the 2 bolt flange...so you can either add all new pipr from header back or attach to the stock exhuast... i have done both....ex's truck was 99 4cyl auto and I left the stock exhaust flange...my 97 i put a new pipe from header back using a standard header reducer from advance auto to go from 3" to 2.5" pretty easy stuff

 

http://cgi.ebay.com/ebaymotors/96-0...013QQitemZ230182942691QQrdZ1QQsspagenameZWDVW this is the type I'm talking about