I just bought one of these slightly used, for 50bux

really dont know much about it, except that its their more aggressive version
can you guys give me an idea of what to expect from it once I install it on my car.

I read some posts about the 260(their less agressive one) that ppl had a rough idle with it. So will my idle be thoroughly out of whack with the 272?
anything else I shoudl know?

I'm installing it on a totally stock d15b7