SO, I am rethinking some things on my truck. I feel like my truck makes more noise than power and I think I may have gone to free flowing with my exhaust.

Here is the lineup now. K&N FIPK, Nology plug wires (Bigger spark), non-resistor plugs, Thorley header, hi flow cat, 2.25" piping and a flowmaster 40.

I'm thinking it may not have enough back pressure due to my muffler choice. I would also consider going back down to 2" piping if it brings the power back to the bottom end.

Any thoughts?

 

did mine with 2 1/4, gutted cat and a flowmaster 60 series and was pretty happy with the results. More mid range punch, if there is such a term for a 22re. Did mine mainly for gas mileage and it helped a mpg or 2. Lots of compliments on the sound and no resonance in the cab

 

I run a 2" exhaust w/ FlowMaster 50-series w/ Delta Flow and it works well. The DF muffler helps reduce resonance in full bodied vehicles:
- http://www.4crawler.com/4Runner.shtml#Engine

 

the best i have had on my truck is hooker header with 3 inch collector straight to a glass pack (no pipe between) and downward dump. it works really good and its tucked up under there very nicely.

 

i run a magnaflow converter to a 2 1/4 flowmaster super 40 sounds great

 

Sounds like it'd be awfully loud, inside and outside. Not to mention no baffles = no spark arrestor, might get you in trouble with the forest service if they wanted to. Not bashing it, my friend runs one similar (stock manifold though) but his is pretty noisy.

I run 2.25 with a basic flowmaster, stock manifold and cat. I didn't set it up this way, but it's got a nice tone to it without being loud, if I could get the cab sealed up you'd hardly hear it inside. I plan on a header eventually, I'll probably go to a 2.5" and a Magnaflow or Flowmaster. I want something quiet.

 

actully its not that bad in the cab plus if you buy a glasspack look on the box and make sure it says "50 state legal" that means it abides by all noise laws and is an adequate spark arrestor

 

FWIW, Tim at DOARacing, Ted at Engnbldr.com, and LCEngineering all recommend a header with a 2.25" exhaust all the way to the muffler (and then whatever you want exiting the muffler) for optimal power from a 22RE. At least that was my conclusion when researching this same question 2 years ago.

 

i have a pace setter header and 2 1/4 pipe in to high flow cat and a flowmaster 40 series. and i have the LCE intake. but my mpg had actually went down alot after the exhaust was done i was getting 27-28 bone stock now i am getting 22-24. i have 94 2wd std cab SWB

 

I would have to concur with ffryn013. I think 2 1/4 might be too big. I have 2 1/4 with a flowmaster 40 and a header. It isn't bad, but it is loud as hell and I have heard that volume is wasted energy. I'm currently looking to go a bit smaller with a quieter muffler.

 

Yup, pretty true.
The problem here is that so many people are thinking like bigger must be better with simply no idea, no engineering behind the thought.

Remember that a gnat fart probably passes a greater volume of exhaust than these engines.

You need all the velocity that you can possibly get out of the engine (BTW, this applies to both intake and exhaust).

Larger diameter = less velocity.
Less velocity = more turbulence(bad)
Less velocity = more surface reversion (bad)
etc.
etc.

Race engineers are always worried about accidentally lower either intake and/or exhaust velocity, which is bad.

As a slight aside, those turbo intake gizmos that you see for sale that spin the air and all types of other crap are really making a mess of the intake.
You want the intake air flow to be a smooth as possible.
The less turbulence, the better. All of these devices are an absolute joke.

Stick with stock sized tubing and if you want to try and do something to help, get the tubing mandrel bent to try and smooth out the inside surface of the tubing (no wrinkles at the bends).
Try routing the tubing creating the least amount of bends as possible.

Don't waste you money on a "high flow cat". All modern cats are "hi flow".
They flow plenty enough. It's simply not a problem.
BTW, as an aside, it's illegal to replace a working cat.



Fred

 

I am running a stock manifold with a FCT High Flow cat and 2 1/4 in tubing b4 and after the 40 series dual chamber, she purrs like a kitten....lol

 

i ran 2 inch all the way back. its a step up from stock and you're not goin overkill so you wont loose your bottom end power. But this was when i had my 89. now i'm rockin 2.25 on my 92 with a 3.4.

 

I'm running Downey's 2.5" header and exhaust and their CAI with a big cone filter.

1. I noticed better throttle response.
2. It is louder.
3. MPG improved to from 19 to 20/21 mixed driving.
4. The header is still shiney.
5. It is louder.

I wouldn't hesitate to recommend the Downey system to any body looking into a new exhaust system. The header is high quality, installed easily and has stayed nice looking.
However, most folks really poo-poo the idea of a 2.5" exhaust system here on yotatech. If I'd been a member of YT prior to installing the exhaust system, I probably would have followed the herd and got something smaller, but I'm happy enough with the performance of my system. I don't know big a difference there is between a 2.25" or a 2.5" exhaust system, if there is any really.

Now that I've modified the exhaust systems on 2 different 4cyl vehicles I suspect a 2" exhaust system is adequate along with a quiet muffler. Maybe I'm just getting old, but I don't get excited anymore over loud mufflers and I don't see where .25" to .5" extra volume in tubing over a 2" diameter is gong to be a significant benefit......especially with a stock head, cam and fuel delivery system.

 

I swapped 2.25 and flowmaster 40 for a magnaflow wannabe and an interesting pipe configuration. 2.25 before the muffler and 2" after. Exhaust shop said it is the best combo for the 22re to get lowe end. For top end they recommended 2.25 on both sides. Thought it would be nice to pass that info on.

 

I made my own muffler with sheetmetal its got 3 chambers. Gave me a TON of bottom end and it sounds great. Quiet but kind of beefy. Went in straight from the factory down pipe (probably why i have the bottom end power) and out with a 2.5" up to a 3" stack

 

I've also heard the Tri-Y is by far the best header.