Originally Posted by
shimano
I tried the 9901 with the 41021 in Australia and can't believe what a waste of money that pipe was. Very disappointed in the performance. Lost heaps of top end and bottom was ok. But only okay. I will order a 9886 or 9853 with a 41001 header and see how that goes, hope I'm not wasting more money on bad advise.
I usually run the 2096/41021 combo and it seems reasonably good. Want more over all grunt though.
I was running the 9901/21 setup with the roma and tried the 9853/41001 and performance was alot better especially top end will be sticking with that setup in my 6TR for 2013
unless a bonito comes my way!
9901/21 better for buggy I reckon
for more grunt try softer clutch springs,shoes/smaller bell/thicker diff fluids/softer tires and up your carb insert, take your crank out get a hobby tool give it a good polish (less friction happy engine) that usually works for me