Spark plug OEM Honda or OEM Subaru

Since then I have take good care of it, replaced the brakes on schedule in August 2020 and then in August 2021 new spark plugs.

Only issue I’ve had is having 2 spark plugs blow out. The first time required a replacement head and the second was fixed with a helicoil. Most reliable vehicle I have owned.

I have an aero 50. I don’t recall what’s recommended on it, but when I was living in the Pacific Northwest, I found that while using premium, it ran significantly better. Smoother idle, better acceleration.

My 2002 had a similar issue. In my case it was the spark plugs, $250 fix.

I remember the first time I did anything besides oil, it was spark plugs and power steering fluid on my old accord. Starting it up after had me nervous, second guessing everything I did.

And timing belt, and spark plug change every 90 K miles or so.

Sounds like it could be a spark plug. For some reason the Prelude likes to eat through them. Shows the exact same symptoms you describe (loss of power, different exhaust note).

a spark plug job on an STI can be a 6+ hour job :thumbdown: