lol thats ticking over at like 3k rpm!
street port is taking the stock ports and opening them up... making longer, they are already smooth inside really...
bridge port gives an extra port next to the main port...
bridge next to a stock port in this pic...
then you have monster port or J port this is the secondary port extended even more... it actually goes under the housing and close to the water jacket and seals... gives no vacume on idle and supposedly is a complete c**t to drive around town lol
periphial is a whoooole different game, you need to take the housings (other porting is done on the plates) cut a f**k off big hole, fit a round runner in it, weld it up and cut and weld a new water jacket lol...
you need to run new inlet mani and everything on it... its biiiig bucks for a pport