I bought my 84 308 gts qv in November. From the first drive, I've noticed a faint whistle coming from the exhaust. I had noticed it before on other 308's and LFSC tells me it's quite normal. Not at idle, nor at full throttle, but at part throttle. I assume it is because of the perforations inside the exhaust tip, and the air traveling past at just the right speed, but then again, I'm not an engineer. Not that it bothers me (okay, maybe just a little), but I know of two alternatives: One is a tubi ($$). Second is a piece of aluminum that fits inside each of the tips. Is it fair to assume that the second alternative is a bad idea?