Porting stock ex header??

[mach5racing4]

Has anyone ever ported or heard of porting a stock 400ex header pipe? please let me know thanks Bob

[boricua]

if you mean grinding the welds, you wont notice a difference.
if otherwise, explain...

[mach5racing4]

i meant widening the end that mounts to the head

[boricua]

unless the port on the head is bigger than the flange on the header, making the header bigger wont make a noticable difference

[mach5racing4]

thanks

[300ex13]

my friend did it and the only time he can notice is WOT and we ever get that fast