[QUOTE=Roelof;15178088]
Originally Posted by
BigC2007
The 9901 is still a populair offroad pipe but has started as a new 3 chamber onroad pipe and so the 2015 and 2052 are well used in both classes.
I believe the now not legal pipe 9886 was onroad from the beginning as well, and that's just from Novarossi.
Others that spring to mind is: 2069(2120), 2013, 2116, 2032. But there are a lot more, though I believe not all are legal for onroad, and in offroad you might want a thick walled pipe. Other then that, mix it up and test it!
Another oddball pipe is the corked up 2015 pipe, 3007, though it didn't work in onroad I had success on some of my offroad engines.