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Is swapping the stock ECU in a 88 4Runner really worth it and has anybody swapped the stock ECU for a haltech elite 750
2" or a 2 1/4" exhaust? The Thorley has 1 1/2" primary tubes and a 2 1/4" collector. Why would you choke that down?
I played with the exhaust tube size with several cars and trucks.
Regarding tubing size, I’ve always focused on getting those torque numbers up in the off-idle to 3500 RPM range. HP at 5,500 RPMs is not where I need the power for my driving style.Gnarls.
I'd lay odds that for better low end torque you'd be better off with a well built header with a smaller (1 3/8") primary tube and (2") collector than you have and carry that to the catalytic converter then increase that to 2 1/4" cat back. Let the header do it's job and not choke it with a small exhaust.
You can do a cheap mandrel bent tube by going up a size in diameter for the bends...…..... (as long as it's not a wrinkle bend)
The internal area of a tube goes down when you bend it (unless it's mandrel).So you pick a bigger tube diameter that has the same internal area as a mandrel bent tube after it's bent.
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