Just wanted to share that I installed a Sprint Booster on my 09 4 cyl and I'm loving it.
Easy to hook up, and very noticeable!

I used a product called Sugru (http://sugru.com/) to fill in any gaps or holes. it makes it look really professional.

I also converted my injen cold air intake into a short ram.
I did it for many reason but mainly b/c I think it's better for the 4cyl, it doesn't cause the rpm to jump past the power curve, directly engaging the v-tec. but I'm not to sure of the technical parts, but I like the response and smooth torque rather than aggressive torque.

thoughts and comments please.