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I don't know why people are so insistent on believing *theories* they read on the internet. I suggest people put it into effect themselves before blindly saying 2.5" is too big.
I did, then a few years later necked it down to 2.25" and LOST low end response and power
thanks. i did not know what kind of header i had. i bought a non running truck 4 $70 and the header was on it so i put it on my 4runner. if anyone knows of any other small motor mods they think i should try i would be interested in hearing them.
If you have done all of the supporting mod's i.e., enlarged the cyls., enlarged the valves, port matched, intake upgrades, and advanced the MAF, then I can see why feel you had less performance w/the smaller exhaust then before, however w/an engine in its stock/near stock form a 2.5" tube and open muffler is simply too large.
Wrong again I didn't FEEL like I lost low end, I did. It wasn't merely my opinion, it was an actual occurance that happened on my truck, not a story told to me by some dudes who worked at a muffler shop. I totally respect the guys who run the exhaust shop I deal with, but they feel all you need for toyotas is 2" and still sell me 2.5" without batting an eye. They're learned over the last 14 years that I test my theories and ideas before buying the more expensive parts.I started out with a 20r in my 80, went to a stock 22r and found a nice gain, then swapped out the head with a stock 20r unit and again noticed another gain, and only after settling on my engine setup did I start experimenting with different size tubing.If you had to leave the line at 3,000 rpm after installing 2.5" exhaust, something else is probably wrong with your truck. Again, nothing special with my engine, simple hybrid setup, crap-tastic weber, nwor tri-y header (which I'm only running because it's supposed to be torquier than the downey), 2.5" tubing with no cat before a 2.5" magnaflow, and with stock gears and 33s I can take off at idle. The lack of gearing obviously hinders my take-offs on inclines and in snow or mud, but I have plenty of grunt to take off at a very low rpm and gain easily in normal driving conditions. Ok, that's the end of my thread hijack, there's probably nothing good that would come from any more discussion on this.
I can see why feel you had less performance
I may only have a 3rd grade education, but that sure reads like you're calling bs to my experience
Absent a dyno or 1/4 mile times, all we have to judge by is how it feels to drive it.
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