depends on where and how you want your power. a slip on wont give much outright performance but it will give a nice little boost in lowend/midrange performance. where as full system hurts low end drivabilty but give the top end gains.
I was really looking for a better sound and cleaner look and you can't beat the Taylor Made in terms of looks IMO. I suck at saving money so if i can ever put $1300 away thats the one i'm going to get. Untill then I guess i'll make due with stock.