When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have it on my 1987 QS. It's louder than I'd like it to be. As far as performance, it did seem to pick up a bit of bottom end, but I haven't really noticed any top end gains..