Heard tat fgk banana 4-2-1 best in top...isit true???
me oso heard same thing like u 4-1 for drag n 4-2-1 for high speed..
Actually hard to say which 1 best. But normally it depend on how you setting the car.
4-1 for normal city use is very good. Fast accelerate, but top no so good. Normally good at 1000 to 5500 rpm.
4-2-1 for circuit use is good, every gear can maintain well in top. Slow a bit compare to 4-1 but good in top. Normally good at 4000 - 8000 rpm.
So 4-1 can't say good for drag only lor, because you still need it at high rpm. I think 4-2-1 better for track and drag.
Can review the report at:
http://www.zerotohundred.com/newforums/toyota/67829-4age-exhaust-experiment-report.html
tip to find a good extractor is:
- The four pipes MUST be equal length, to within less than 1/4"/6mm.
- The four pipes must NOT have any crushed bends in them anywhere at all.
- The four pipes must go into the collector in the same sequence as the firing order of the engine, ie, 1-3-4-2. Many of them simple put the pipes into the collector in any order that's convenient, but these sort make less power than a good set.
Anyway, my idea might be wrong, please edit me if found it wrong info. Thanks.