Its marginal like most bolt ons (especially on n/a engines) - ideally it will give more time for air to cool & increases air flow before the throttle body - works hand in hand with an aftermarket air intake... a few WHP if I had to guess - or so it did on my 8th gen Si.What performance improvement does the throttle body spacer provide?
Dont doubt your purchase... a spacer with an intake WILL increase gains its proven + it'll really compliment the intake sound. I shall be getting one as well just have some other mods to wrap up 1st.Honestly, I don't know if it provides performance gains, as I have not installed it yet. Ideally, installed with a good intake, it will allow some more space for air to cool after MAF sensor and better overall airflow directly into the intake with more direct flow and less turbulence, leading to better throttle response. The engine and intake was designed initially for economy and ease of maintenance, not performance. I am ok with taking a bit of a gamble on it actually improving anything but also looking cool.
In practice, have no effin' clue if it works, as I have not installed it yet, and just going by internet claims and purdy looking billet part/color. Haha. Couple of pages back you can read comments from somebody who actually has it installed already.
For somebody who is looking to do a single, cheap modification,that totally improves this car and makes it so much more fun to drive, I would recommend a Progress Technology Rear Sway bar replacement as the first upgrade instead: Progress Technology, 62.2152, rear anti sway bar, 2019 Toyota Corolla, C-HR Rear
That's a myth. In reality it extends the air flow after TB and could mess with the A/F calculation as MAF is shifted away from its intended position...The spacer I've been told gives you 5 horses... But the main reason I got it was for the acceleration factor. It's an easy install, just make sure you put the spacer in the correct position for a good seal. It is possible to put it in upside down etc. If you don't get a good seal on it, it will give you an engine light and even put the car in limp mode.
This was from other guys I talked to who mistakenly put the spacer in the wrong position. Don't over tighten the bolts.
If you are lucky, you will not loose any HP. Otherwise the spacer gains are +0.0001 HP...Haven't put it on the car yet, but just got my GGP throttle body spacer in the mail. Nice machining and color! Looking forward to installing, but need to find my silicone 0-ring grease.