My description is going to be as technical as the thread title
A bit difficult to explain really, but here goes...
When you open the bonnet of a standard Supra and rev the engine, it makes that kind of massive roar/suction noise. Then when you stick a Hiper or something on, you can't hear it as well because of the sound of the exhaust. (with me so far? )
Well in the last few days, I've noticed that my engine has started making that sound, but many times louder than the sound of a standard Supra - I can hear it over the Hiper, and even on the motorway! I actually really like the noise, it sounds really meaty, like a truck engine or something, but clearly its not normal as its only started doing it recently.
I hope someone understands what I'm on about, I wasn't sure how else to explain it!
Oh, by the way, the car is driving fine - no boost (or other) problems that I'm aware of.
Thanks in advance!