run the 20g, ur car will be fine if properly tuned and ur not trying to run crazy boost. My car dnt spool til around there so its not that big of a deal. The b series rev pretty quick ne way so u wont have an ungodly amount of lag. If ur that concerned about lag and dnt already have one get a lightweight flywheel. Remember, turbo lag in a front wheel drive is like some budget traction control. lol!!!