4 stroke tech advice

[st3w]

Bought my first 4 stroke about a month ago and now am starting to get the hp itch. First question, I removed the spark arrestor from the stock pipe. Do I need to rejet for this? Do you read the spark plug like you would for a 2 stroke? I know, everyone's going to say get a slip-on or full exhaust which I will in the near future. I just wanted a little more tone for now even if it still isn't all that impressive. This brings me to the next question what's the best slip-on or full exhaust for an EX. I know that this will probably get debated over and over, but just get me going in the right direction. Lastly, does that removing the choke trick really work? Thanks for the newbie help!
later,
st3w

[HondaOnly]

The three full systems i'd look at are HMF, LRD Pro 4 and the Curtis Sparks X-4 (if stock engine or trail ride) or X-6 if you do MX/ have a modified engine

[tigerdog]

i recewntly took the choke out of mine , i was happy with the differance. but i have other mods also .
i would recomend removing it:) :)