I wasted 100 on the billet 1/2 plenum spacer and without a doubt with other bolt ons or cai, exhaust, and cleaning the throttlebody, I definitely without a doubt noticed a performance increase better throttle response and better torque low to medium high rpm's. So I wouldn't believe everything that's said on here. Because I felt the difference rite from sitting in my seat. Yeah it's not going to be this huge drastic difference. But it still made a very noticeable difference and I would buy one if you are questioning it. Look at the act runner nearly any gains from that $400 a wack unless you buy a tune or get your car dyno tuned. Long story short. I believed that I wasted my money on an ict plenum intake spacer and boy was I surprised. Buy it and with other bolt ons you won't be wasting your money. And that's all I have to say about that. Also not to mention that tomoro I'll be getting my accufab 70mm throttlebody to add to that. Stay tuned for the next bolt on update. And with the combination of the two. We. Shall see how she runs.