hi i was looking for some advise on my sons lt50 & lta50 i have removed all the restrictors put in a 70 jet drilled air box etc what it was i had read some where befor about grinding the air intake down where the lip is and wideing the port on the head 2 the same size does the give your lt more power and should u do the same at the exhaust side any pictures of this would be great if any 1 has them cheers