PlainCrazy,


If you shorten the header length, the #3266 tuned pipe will want to boost the performance in a higher RPM range, with smaller props.

If, however, you change and sharpen the bend in the header's curve, it may hamper the gas flow within it.
If this happens, performance will be harmed; even worse if the cross-section is deformed.

So if you chose to do this, do it on a mandrel, that would make a new, smaller curve, without changing the cross-section of the tube.

You may want to buy several of these #3265/26 headers, to make sure you get the best result.