Guys, i've changed plugs and filter. And now im planning to change the extractor to hotbits extractor 4-2-1. Will it somehow improve my car pickup? I dont plan to change the exhaust at the moment.

Saw at speedworks website, that thing will cost me rm580. Does this include installation or not? If not, how much is the installation cost will be? And how long does it take to change this thing? I pm'ed the speedworks guys over here but no response yet lol...