I just recently picked up an AP1 and i hear a groaning/grinding almost a buzz sound when i let off the gas in 2nd and 3rd round 2500 rmp. From inside the car it sounds like intake growl but i want to besure it's not somthing that is a bad sound. Is this normal with the F20C?

Thanks

 

I can't say i have ever heard this. My 02 had a slight buzz but i kinda liked it. I guess honda "fixed" it, because my 05 does not do it.