Im no expert on FB engines & I know all boxers have that "tap tap tap" sound, but it sounds a bit noisy to me.
Are these cars you're looking at buying?
That engine doesn't right to me There's a serious knock of some kind, thats for sure.
And did I also hear right, it's a typical 2.5ltr motor for a '98
I always thought the '98 had a 2.0ltr & that the 2.5ltr didn't appear until a few years later
At least in Australia anyway.
Regards
Mr Turbo