It is stated that standard bolt on exhaust headers do not fit the bigbore 300cc Tyga kit,8mm studs are present on the exhaust port as per the standard Honda MC21 barrels.

Does the distance(center to center) between studs differ from the standard item?

I thank all in advance

Keep it smokin

i can measure them tomorrow for you . The angle of the spigot is differant . 300 kit is an easy way to bhp

Please do. Do you have a Tyga 300 kit on your bike?
And last thing, that contact of Dr, Neels please. Would like
to try him out. Can you please send me your mail adress
as I want to mail you some pics of my bike. I am still to
new to this site and I don't know how to ad a picture here.

Howzit ,
the 150 flanges plates slip onto a 21 barrel - so the bolts are the same distance apart .

I have done the 300 conversion , check out Neal's 300 on a previous post . You can see some expected gains between the two motors .

I will send you his number via email. nealgreyplumba@hotmail.com.